Finding the Fourth Proportional to 23,099.98, 31,877.88 and 12,489.61

Step by Step Solution

1. Step 1: Write the proportion equation
   23,099.98 : 31,877.88 = 12,489.61 : x
2. Step 2: Convert to fraction form
   23,099.98/31,877.88 = 12,489.61/x
3. Step 3: Cross multiply
   23,099.98x = 31,877.88 × 12,489.61
4. Step 4: Simplify right side
   23,099.98x = 398,142,288.83
5. Step 5: Solve for x
   x = 398,142,288.83/23,099.98
6. Step 6: Final answer
   x = 17,235.61