Finding the Fourth Proportional to 71,813.46, 99,100.89 and 39,981.72

Step by Step Solution

1. Step 1: Write the proportion equation
   71,813.46 : 99,100.89 = 39,981.72 : x
2. Step 2: Convert to fraction form
   71,813.46/99,100.89 = 39,981.72/x
3. Step 3: Cross multiply
   71,813.46x = 99,100.89 × 39,981.72
4. Step 4: Simplify right side
   71,813.46x = 3,962,224,035.73
5. Step 5: Solve for x
   x = 3,962,224,035.73/71,813.46
6. Step 6: Final answer
   x = 55,173.84