Finding the Fourth Proportional to 21,215.52, 29,276.24 and 12,265.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,215.52 : 29,276.24 = 12,265.83 : x
2. Step 2: Convert to fraction form
   21,215.52/29,276.24 = 12,265.83/x
3. Step 3: Cross multiply
   21,215.52x = 29,276.24 × 12,265.83
4. Step 4: Simplify right side
   21,215.52x = 359,097,321.55
5. Step 5: Solve for x
   x = 359,097,321.55/21,215.52
6. Step 6: Final answer
   x = 16,926.16