Finding the Fourth Proportional to 10,981.80, 16,472.72 and 5,142.52

Step by Step Solution

1. Step 1: Write the proportion equation
   10,981.80 : 16,472.72 = 5,142.52 : x
2. Step 2: Convert to fraction form
   10,981.80/16,472.72 = 5,142.52/x
3. Step 3: Cross multiply
   10,981.80x = 16,472.72 × 5,142.52
4. Step 4: Simplify right side
   10,981.80x = 84,711,292.05
5. Step 5: Solve for x
   x = 84,711,292.05/10,981.80
6. Step 6: Final answer
   x = 7,713.79