Finding the Fourth Proportional to 3,972.02, 5,487.98 and 3,139.11

Step by Step Solution

1. Step 1: Write the proportion equation
   3,972.02 : 5,487.98 = 3,139.11 : x
2. Step 2: Convert to fraction form
   3,972.02/5,487.98 = 3,139.11/x
3. Step 3: Cross multiply
   3,972.02x = 5,487.98 × 3,139.11
4. Step 4: Simplify right side
   3,972.02x = 17,227,372.90
5. Step 5: Solve for x
   x = 17,227,372.90/3,972.02
6. Step 6: Final answer
   x = 4,337.18