Finding the Fourth Proportional to 6,139.89, 8,472.84 and 3,345.39

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.89 : 8,472.84 = 3,345.39 : x
2. Step 2: Convert to fraction form
   6,139.89/8,472.84 = 3,345.39/x
3. Step 3: Cross multiply
   6,139.89x = 8,472.84 × 3,345.39
4. Step 4: Simplify right side
   6,139.89x = 28,344,954.21
5. Step 5: Solve for x
   x = 28,344,954.21/6,139.89
6. Step 6: Final answer
   x = 4,616.52