Finding the Fourth Proportional to 9,086.31, 12,539.15 and 5,107.39

Step by Step Solution

1. Step 1: Write the proportion equation
   9,086.31 : 12,539.15 = 5,107.39 : x
2. Step 2: Convert to fraction form
   9,086.31/12,539.15 = 5,107.39/x
3. Step 3: Cross multiply
   9,086.31x = 12,539.15 × 5,107.39
4. Step 4: Simplify right side
   9,086.31x = 64,042,320.32
5. Step 5: Solve for x
   x = 64,042,320.32/9,086.31
6. Step 6: Final answer
   x = 7,048.22