Finding the Fourth Proportional to 72,007.90, 99,366.24 and 39,742.81

Step by Step Solution

1. Step 1: Write the proportion equation
   72,007.90 : 99,366.24 = 39,742.81 : x
2. Step 2: Convert to fraction form
   72,007.90/99,366.24 = 39,742.81/x
3. Step 3: Cross multiply
   72,007.90x = 99,366.24 × 39,742.81
4. Step 4: Simplify right side
   72,007.90x = 3,949,093,596.73
5. Step 5: Solve for x
   x = 3,949,093,596.73/72,007.90
6. Step 6: Final answer
   x = 54,842.50