Finding the Fourth Proportional to 9,128.70, 12,597.39 and 5,149.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.70 : 12,597.39 = 5,149.98 : x
2. Step 2: Convert to fraction form
   9,128.70/12,597.39 = 5,149.98/x
3. Step 3: Cross multiply
   9,128.70x = 12,597.39 × 5,149.98
4. Step 4: Simplify right side
   9,128.70x = 64,876,306.55
5. Step 5: Solve for x
   x = 64,876,306.55/9,128.70
6. Step 6: Final answer
   x = 7,106.85