Finding the Fourth Proportional to 9,271.97, 12,785.15 and 7,142.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,271.97 : 12,785.15 = 7,142.89 : x
2. Step 2: Convert to fraction form
   9,271.97/12,785.15 = 7,142.89/x
3. Step 3: Cross multiply
   9,271.97x = 12,785.15 × 7,142.89
4. Step 4: Simplify right side
   9,271.97x = 91,322,820.44
5. Step 5: Solve for x
   x = 91,322,820.44/9,271.97
6. Step 6: Final answer
   x = 9,849.34