Finding the Fourth Proportional to 6,139.62, 8,472.69 and 3,345.30

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.62 : 8,472.69 = 3,345.30 : x
2. Step 2: Convert to fraction form
   6,139.62/8,472.69 = 3,345.30/x
3. Step 3: Cross multiply
   6,139.62x = 8,472.69 × 3,345.30
4. Step 4: Simplify right side
   6,139.62x = 28,343,689.86
5. Step 5: Solve for x
   x = 28,343,689.86/6,139.62
6. Step 6: Final answer
   x = 4,616.52