Finding the Fourth Proportional to 91,384.91, 137,079.25 and 28,205.07

Step by Step Solution

1. Step 1: Write the proportion equation
   91,384.91 : 137,079.25 = 28,205.07 : x
2. Step 2: Convert to fraction form
   91,384.91/137,079.25 = 28,205.07/x
3. Step 3: Cross multiply
   91,384.91x = 137,079.25 × 28,205.07
4. Step 4: Simplify right side
   91,384.91x = 3,866,329,771.28
5. Step 5: Solve for x
   x = 3,866,329,771.28/91,384.91
6. Step 6: Final answer
   x = 42,308.18