Finding the Fourth Proportional to 12,123.31, 16,726.15 and 9,881.33

Step by Step Solution

1. Step 1: Write the proportion equation
   12,123.31 : 16,726.15 = 9,881.33 : x
2. Step 2: Convert to fraction form
   12,123.31/16,726.15 = 9,881.33/x
3. Step 3: Cross multiply
   12,123.31x = 16,726.15 × 9,881.33
4. Step 4: Simplify right side
   12,123.31x = 165,276,607.78
5. Step 5: Solve for x
   x = 165,276,607.78/12,123.31
6. Step 6: Final answer
   x = 13,632.96