Finding the Fourth Proportional to 72,962.71, 100,688.54 and 39,428.71

Step by Step Solution

1. Step 1: Write the proportion equation
   72,962.71 : 100,688.54 = 39,428.71 : x
2. Step 2: Convert to fraction form
   72,962.71/100,688.54 = 39,428.71/x
3. Step 3: Cross multiply
   72,962.71x = 100,688.54 × 39,428.71
4. Step 4: Simplify right side
   72,962.71x = 3,970,019,243.98
5. Step 5: Solve for x
   x = 3,970,019,243.98/72,962.71
6. Step 6: Final answer
   x = 54,411.62