Finding the Fourth Proportional to 143,591.86, 215,520.78 and 72,564.48

Step by Step Solution

1. Step 1: Write the proportion equation
   143,591.86 : 215,520.78 = 72,564.48 : x
2. Step 2: Convert to fraction form
   143,591.86/215,520.78 = 72,564.48/x
3. Step 3: Cross multiply
   143,591.86x = 215,520.78 × 72,564.48
4. Step 4: Simplify right side
   143,591.86x = 15,639,153,057.78
5. Step 5: Solve for x
   x = 15,639,153,057.78/143,591.86
6. Step 6: Final answer
   x = 108,913.92