Finding the Fourth Proportional to 21,521.83, 29,702.89 and 12,092.21

Step by Step Solution

1. Step 1: Write the proportion equation
   21,521.83 : 29,702.89 = 12,092.21 : x
2. Step 2: Convert to fraction form
   21,521.83/29,702.89 = 12,092.21/x
3. Step 3: Cross multiply
   21,521.83x = 29,702.89 × 12,092.21
4. Step 4: Simplify right side
   21,521.83x = 359,173,583.49
5. Step 5: Solve for x
   x = 359,173,583.49/21,521.83
6. Step 6: Final answer
   x = 16,688.80