Finding the Fourth Proportional to 9,321.18, 12,862.95 and 5,129.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,321.18 : 12,862.95 = 5,129.34 : x
2. Step 2: Convert to fraction form
   9,321.18/12,862.95 = 5,129.34/x
3. Step 3: Cross multiply
   9,321.18x = 12,862.95 × 5,129.34
4. Step 4: Simplify right side
   9,321.18x = 65,978,443.95
5. Step 5: Solve for x
   x = 65,978,443.95/9,321.18
6. Step 6: Final answer
   x = 7,078.34