Finding the Fourth Proportional to 9,128.88, 12,596.42 and 5,149.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.88 : 12,596.42 = 5,149.91 : x
2. Step 2: Convert to fraction form
   9,128.88/12,596.42 = 5,149.91/x
3. Step 3: Cross multiply
   9,128.88x = 12,596.42 × 5,149.91
4. Step 4: Simplify right side
   9,128.88x = 64,870,340.59
5. Step 5: Solve for x
   x = 64,870,340.59/9,128.88
6. Step 6: Final answer
   x = 7,106.06