Finding the Fourth Proportional to 21,032.66, 31,546.89 and 8,553.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,032.66 : 31,546.89 = 8,553.42 : x
2. Step 2: Convert to fraction form
   21,032.66/31,546.89 = 8,553.42/x
3. Step 3: Cross multiply
   21,032.66x = 31,546.89 × 8,553.42
4. Step 4: Simplify right side
   21,032.66x = 269,833,799.86
5. Step 5: Solve for x
   x = 269,833,799.86/21,032.66
6. Step 6: Final answer
   x = 12,829.28