Finding the Fourth Proportional to 9,108.85, 12,569.77 and 5,129.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,108.85 : 12,569.77 = 5,129.89 : x
2. Step 2: Convert to fraction form
   9,108.85/12,569.77 = 5,129.89/x
3. Step 3: Cross multiply
   9,108.85x = 12,569.77 × 5,129.89
4. Step 4: Simplify right side
   9,108.85x = 64,481,537.43
5. Step 5: Solve for x
   x = 64,481,537.43/9,108.85
6. Step 6: Final answer
   x = 7,079.00