Finding the Fourth Proportional to 6,139.80, 8,471.72 and 3,902.04

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.80 : 8,471.72 = 3,902.04 : x
2. Step 2: Convert to fraction form
   6,139.80/8,471.72 = 3,902.04/x
3. Step 3: Cross multiply
   6,139.80x = 8,471.72 × 3,902.04
4. Step 4: Simplify right side
   6,139.80x = 33,056,990.31
5. Step 5: Solve for x
   x = 33,056,990.31/6,139.80
6. Step 6: Final answer
   x = 5,384.05