Finding the Fourth Proportional to 21,142.95, 31,702.91 and 10,763.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,142.95 : 31,702.91 = 10,763.43 : x
2. Step 2: Convert to fraction form
   21,142.95/31,702.91 = 10,763.43/x
3. Step 3: Cross multiply
   21,142.95x = 31,702.91 × 10,763.43
4. Step 4: Simplify right side
   21,142.95x = 341,231,998.76
5. Step 5: Solve for x
   x = 341,231,998.76/21,142.95
6. Step 6: Final answer
   x = 16,139.28