Finding the Fourth Proportional to 15,642.52, 21,588.73 and 8,926.61

Step by Step Solution

1. Step 1: Write the proportion equation
   15,642.52 : 21,588.73 = 8,926.61 : x
2. Step 2: Convert to fraction form
   15,642.52/21,588.73 = 8,926.61/x
3. Step 3: Cross multiply
   15,642.52x = 21,588.73 × 8,926.61
4. Step 4: Simplify right side
   15,642.52x = 192,714,042.85
5. Step 5: Solve for x
   x = 192,714,042.85/15,642.52
6. Step 6: Final answer
   x = 12,319.89