Finding the Fourth Proportional to 6,139.30, 8,612.30 and 6,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.30 : 8,612.30 = 6,139.30 : x
2. Step 2: Convert to fraction form
   6,139.30/8,612.30 = 6,139.30/x
3. Step 3: Cross multiply
   6,139.30x = 8,612.30 × 6,139.30
4. Step 4: Simplify right side
   6,139.30x = 52,873,493.39
5. Step 5: Solve for x
   x = 52,873,493.39/6,139.30
6. Step 6: Final answer
   x = 8,612.30