Finding the Fourth Proportional to 21,290.28, 29,167.82 and 20,492.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,290.28 : 29,167.82 = 20,492.18 : x
2. Step 2: Convert to fraction form
   21,290.28/29,167.82 = 20,492.18/x
3. Step 3: Cross multiply
   21,290.28x = 29,167.82 × 20,492.18
4. Step 4: Simplify right side
   21,290.28x = 597,712,155.57
5. Step 5: Solve for x
   x = 597,712,155.57/21,290.28
6. Step 6: Final answer
   x = 28,074.42