Finding the Fourth Proportional to 9,128.97, 12,598.79 and 5,149.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.97 : 12,598.79 = 5,149.89 : x
2. Step 2: Convert to fraction form
   9,128.97/12,598.79 = 5,149.89/x
3. Step 3: Cross multiply
   9,128.97x = 12,598.79 × 5,149.89
4. Step 4: Simplify right side
   9,128.97x = 64,882,356.88
5. Step 5: Solve for x
   x = 64,882,356.88/9,128.97
6. Step 6: Final answer
   x = 7,107.30