Finding the Fourth Proportional to 21,498.29, 32,209.30 and 8,990.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,498.29 : 32,209.30 = 8,990.75 : x
2. Step 2: Convert to fraction form
   21,498.29/32,209.30 = 8,990.75/x
3. Step 3: Cross multiply
   21,498.29x = 32,209.30 × 8,990.75
4. Step 4: Simplify right side
   21,498.29x = 289,585,763.98
5. Step 5: Solve for x
   x = 289,585,763.98/21,498.29
6. Step 6: Final answer
   x = 13,470.18