Finding the Fourth Proportional to 15,710.54, 21,678.89 and 8,995.55

Step by Step Solution

1. Step 1: Write the proportion equation
   15,710.54 : 21,678.89 = 8,995.55 : x
2. Step 2: Convert to fraction form
   15,710.54/21,678.89 = 8,995.55/x
3. Step 3: Cross multiply
   15,710.54x = 21,678.89 × 8,995.55
4. Step 4: Simplify right side
   15,710.54x = 195,013,385.57
5. Step 5: Solve for x
   x = 195,013,385.57/15,710.54
6. Step 6: Final answer
   x = 12,412.91