Finding the Fourth Proportional to 71,807.63, 99,096.24 and 39,978.68

Step by Step Solution

1. Step 1: Write the proportion equation
   71,807.63 : 99,096.24 = 39,978.68 : x
2. Step 2: Convert to fraction form
   71,807.63/99,096.24 = 39,978.68/x
3. Step 3: Cross multiply
   71,807.63x = 99,096.24 × 39,978.68
4. Step 4: Simplify right side
   71,807.63x = 3,961,736,868.16
5. Step 5: Solve for x
   x = 3,961,736,868.16/71,807.63
6. Step 6: Final answer
   x = 55,171.53