Finding the Fourth Proportional to 9,128.48, 12,597.31 and 5,149.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.48 : 12,597.31 = 5,149.59 : x
2. Step 2: Convert to fraction form
   9,128.48/12,597.31 = 5,149.59/x
3. Step 3: Cross multiply
   9,128.48x = 12,597.31 × 5,149.59
4. Step 4: Simplify right side
   9,128.48x = 64,870,951.27
5. Step 5: Solve for x
   x = 64,870,951.27/9,128.48
6. Step 6: Final answer
   x = 7,106.43