Finding the Fourth Proportional to 71,751.52, 99,020.98 and 39,921.10

Step by Step Solution

1. Step 1: Write the proportion equation
   71,751.52 : 99,020.98 = 39,921.10 : x
2. Step 2: Convert to fraction form
   71,751.52/99,020.98 = 39,921.10/x
3. Step 3: Cross multiply
   71,751.52x = 99,020.98 × 39,921.10
4. Step 4: Simplify right side
   71,751.52x = 3,953,026,804.02
5. Step 5: Solve for x
   x = 3,953,026,804.02/71,751.52
6. Step 6: Final answer
   x = 55,093.28