Finding the Fourth Proportional to 21,445.59, 29,569.18 and 18,456.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,445.59 : 29,569.18 = 18,456.29 : x
2. Step 2: Convert to fraction form
   21,445.59/29,569.18 = 18,456.29/x
3. Step 3: Cross multiply
   21,445.59x = 29,569.18 × 18,456.29
4. Step 4: Simplify right side
   21,445.59x = 545,737,361.14
5. Step 5: Solve for x
   x = 545,737,361.14/21,445.59
6. Step 6: Final answer
   x = 25,447.53