Finding the Fourth Proportional to 6,139.50, 8,472.69 and 3,345.18

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.50 : 8,472.69 = 3,345.18 : x
2. Step 2: Convert to fraction form
   6,139.50/8,472.69 = 3,345.18/x
3. Step 3: Cross multiply
   6,139.50x = 8,472.69 × 3,345.18
4. Step 4: Simplify right side
   6,139.50x = 28,342,673.13
5. Step 5: Solve for x
   x = 28,342,673.13/6,139.50
6. Step 6: Final answer
   x = 4,616.45