Finding the Fourth Proportional to 9,147.71, 13,644.28 and 8,870.83

Step by Step Solution

1. Step 1: Write the proportion equation
   9,147.71 : 13,644.28 = 8,870.83 : x
2. Step 2: Convert to fraction form
   9,147.71/13,644.28 = 8,870.83/x
3. Step 3: Cross multiply
   9,147.71x = 13,644.28 × 8,870.83
4. Step 4: Simplify right side
   9,147.71x = 121,036,088.35
5. Step 5: Solve for x
   x = 121,036,088.35/9,147.71
6. Step 6: Final answer
   x = 13,231.30