Finding the Fourth Proportional to 6,139.69, 8,472.83 and 3,487.15

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.69 : 8,472.83 = 3,487.15 : x
2. Step 2: Convert to fraction form
   6,139.69/8,472.83 = 3,487.15/x
3. Step 3: Cross multiply
   6,139.69x = 8,472.83 × 3,487.15
4. Step 4: Simplify right side
   6,139.69x = 29,545,969.33
5. Step 5: Solve for x
   x = 29,545,969.33/6,139.69
6. Step 6: Final answer
   x = 4,812.29