Finding the Fourth Proportional to 21,084.86, 29,092.31 and 12,589.73

Step by Step Solution

1. Step 1: Write the proportion equation
   21,084.86 : 29,092.31 = 12,589.73 : x
2. Step 2: Convert to fraction form
   21,084.86/29,092.31 = 12,589.73/x
3. Step 3: Cross multiply
   21,084.86x = 29,092.31 × 12,589.73
4. Step 4: Simplify right side
   21,084.86x = 366,264,510.34
5. Step 5: Solve for x
   x = 366,264,510.34/21,084.86
6. Step 6: Final answer
   x = 17,370.97