Finding the Fourth Proportional to 71,810.84, 99,096.72 and 39,978.14

Step by Step Solution

1. Step 1: Write the proportion equation
   71,810.84 : 99,096.72 = 39,978.14 : x
2. Step 2: Convert to fraction form
   71,810.84/99,096.72 = 39,978.14/x
3. Step 3: Cross multiply
   71,810.84x = 99,096.72 × 39,978.14
4. Step 4: Simplify right side
   71,810.84x = 3,961,702,545.70
5. Step 5: Solve for x
   x = 3,961,702,545.70/71,810.84
6. Step 6: Final answer
   x = 55,168.59