Finding the Fourth Proportional to 21,103.88, 31,666.62 and 8,633.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,103.88 : 31,666.62 = 8,633.12 : x
2. Step 2: Convert to fraction form
   21,103.88/31,666.62 = 8,633.12/x
3. Step 3: Cross multiply
   21,103.88x = 31,666.62 × 8,633.12
4. Step 4: Simplify right side
   21,103.88x = 273,381,730.45
5. Step 5: Solve for x
   x = 273,381,730.45/21,103.88
6. Step 6: Final answer
   x = 12,954.10