Finding the Fourth Proportional to 71,699.72, 98,945 and 39,868.34

Step by Step Solution

1. Step 1: Write the proportion equation
   71,699.72 : 98,945 = 39,868.34 : x
2. Step 2: Convert to fraction form
   71,699.72/98,945 = 39,868.34/x
3. Step 3: Cross multiply
   71,699.72x = 98,945 × 39,868.34
4. Step 4: Simplify right side
   71,699.72x = 3,944,772,901.30
5. Step 5: Solve for x
   x = 3,944,772,901.30/71,699.72
6. Step 6: Final answer
   x = 55,017.97