Finding the Fourth Proportional to 15,766.64, 21,758.12 and 8,693.31

Step by Step Solution

1. Step 1: Write the proportion equation
   15,766.64 : 21,758.12 = 8,693.31 : x
2. Step 2: Convert to fraction form
   15,766.64/21,758.12 = 8,693.31/x
3. Step 3: Cross multiply
   15,766.64x = 21,758.12 × 8,693.31
4. Step 4: Simplify right side
   15,766.64x = 189,150,038.71
5. Step 5: Solve for x
   x = 189,150,038.71/15,766.64
6. Step 6: Final answer
   x = 11,996.86