Finding the Fourth Proportional to 9,320.44, 12,862.20 and 5,128.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,320.44 : 12,862.20 = 5,128.69 : x
2. Step 2: Convert to fraction form
   9,320.44/12,862.20 = 5,128.69/x
3. Step 3: Cross multiply
   9,320.44x = 12,862.20 × 5,128.69
4. Step 4: Simplify right side
   9,320.44x = 65,966,223.60
5. Step 5: Solve for x
   x = 65,966,223.60/9,320.44
6. Step 6: Final answer
   x = 7,077.59