The first, second and fouth terms of a proportional are 5,15and 90 respectively. Find the third term.

Explanation

To find the third term in the proportional sequence where the first, second, and fourth terms are given as 5, 15, and 90 respectively, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Terms**:
We have the first term (a) = 5, the second term (b) = 15, the third term (c) = x (unknown), and the fourth term (d) = 90.

2. **Set Up the Proportional Relationship**:
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