Finding the Fourth Proportional to 10,116.91, 15,142.92 and 5,425.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,116.91 : 15,142.92 = 5,425.12 : x
2. Step 2: Convert to fraction form
   10,116.91/15,142.92 = 5,425.12/x
3. Step 3: Cross multiply
   10,116.91x = 15,142.92 × 5,425.12
4. Step 4: Simplify right side
   10,116.91x = 82,152,158.15
5. Step 5: Solve for x
   x = 82,152,158.15/10,116.91
6. Step 6: Final answer
   x = 8,120.28