Finding the Fourth Proportional to 21,215.29, 29,273.58 and 12,263.62

Step by Step Solution

1. Step 1: Write the proportion equation
   21,215.29 : 29,273.58 = 12,263.62 : x
2. Step 2: Convert to fraction form
   21,215.29/29,273.58 = 12,263.62/x
3. Step 3: Cross multiply
   21,215.29x = 29,273.58 × 12,263.62
4. Step 4: Simplify right side
   21,215.29x = 359,000,061.16
5. Step 5: Solve for x
   x = 359,000,061.16/21,215.29
6. Step 6: Final answer
   x = 16,921.76