Finding the Fourth Proportional to 9,320.42, 12,862.14 and 5,128.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,320.42 : 12,862.14 = 5,128.58 : x
2. Step 2: Convert to fraction form
   9,320.42/12,862.14 = 5,128.58/x
3. Step 3: Cross multiply
   9,320.42x = 12,862.14 × 5,128.58
4. Step 4: Simplify right side
   9,320.42x = 65,964,513.96
5. Step 5: Solve for x
   x = 65,964,513.96/9,320.42
6. Step 6: Final answer
   x = 7,077.42