Finding the Fourth Proportional to 21,423.59, 29,549.41 and 18,434.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,423.59 : 29,549.41 = 18,434.28 : x
2. Step 2: Convert to fraction form
   21,423.59/29,549.41 = 18,434.28/x
3. Step 3: Cross multiply
   21,423.59x = 29,549.41 × 18,434.28
4. Step 4: Simplify right side
   21,423.59x = 544,722,162.50
5. Step 5: Solve for x
   x = 544,722,162.50/21,423.59
6. Step 6: Final answer
   x = 25,426.28