Finding the Fourth Proportional to 72,116.71, 99,520.59 and 40,285.33

Step by Step Solution

1. Step 1: Write the proportion equation
   72,116.71 : 99,520.59 = 40,285.33 : x
2. Step 2: Convert to fraction form
   72,116.71/99,520.59 = 40,285.33/x
3. Step 3: Cross multiply
   72,116.71x = 99,520.59 × 40,285.33
4. Step 4: Simplify right side
   72,116.71x = 4,009,219,809.94
5. Step 5: Solve for x
   x = 4,009,219,809.94/72,116.71
6. Step 6: Final answer
   x = 55,593.49