Finding the Fourth Proportional to 21,002.59, 31,492.94 and 9,906.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,002.59 : 31,492.94 = 9,906.29 : x
2. Step 2: Convert to fraction form
   21,002.59/31,492.94 = 9,906.29/x
3. Step 3: Cross multiply
   21,002.59x = 31,492.94 × 9,906.29
4. Step 4: Simplify right side
   21,002.59x = 311,978,196.59
5. Step 5: Solve for x
   x = 311,978,196.59/21,002.59
6. Step 6: Final answer
   x = 14,854.27