Finding the Fourth Proportional to 21,766.40, 30,026.56 and 14,217.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,766.40 : 30,026.56 = 14,217.15 : x
2. Step 2: Convert to fraction form
   21,766.40/30,026.56 = 14,217.15/x
3. Step 3: Cross multiply
   21,766.40x = 30,026.56 × 14,217.15
4. Step 4: Simplify right side
   21,766.40x = 426,892,107.50
5. Step 5: Solve for x
   x = 426,892,107.50/21,766.40
6. Step 6: Final answer
   x = 19,612.44