Finding the Fourth Proportional to 71,810.96, 99,103.06 and 39,979.16

Step by Step Solution

1. Step 1: Write the proportion equation
   71,810.96 : 99,103.06 = 39,979.16 : x
2. Step 2: Convert to fraction form
   71,810.96/99,103.06 = 39,979.16/x
3. Step 3: Cross multiply
   71,810.96x = 99,103.06 × 39,979.16
4. Step 4: Simplify right side
   71,810.96x = 3,962,057,092.23
5. Step 5: Solve for x
   x = 3,962,057,092.23/71,810.96
6. Step 6: Final answer
   x = 55,173.43