Finding the Fourth Proportional to 21,162.60, 31,728.71 and 10,625.11

Step by Step Solution

1. Step 1: Write the proportion equation
   21,162.60 : 31,728.71 = 10,625.11 : x
2. Step 2: Convert to fraction form
   21,162.60/31,728.71 = 10,625.11/x
3. Step 3: Cross multiply
   21,162.60x = 31,728.71 × 10,625.11
4. Step 4: Simplify right side
   21,162.60x = 337,120,981.15
5. Step 5: Solve for x
   x = 337,120,981.15/21,162.60
6. Step 6: Final answer
   x = 15,930.04