Finding the Fourth Proportional to 21,726.61, 29,985.24 and 13,233.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,726.61 : 29,985.24 = 13,233.71 : x
2. Step 2: Convert to fraction form
   21,726.61/29,985.24 = 13,233.71/x
3. Step 3: Cross multiply
   21,726.61x = 29,985.24 × 13,233.71
4. Step 4: Simplify right side
   21,726.61x = 396,815,904.27
5. Step 5: Solve for x
   x = 396,815,904.27/21,726.61
6. Step 6: Final answer
   x = 18,264.05