Finding the Fourth Proportional to 21,404.22, 32,063.24 and 9,990

Step by Step Solution

1. Step 1: Write the proportion equation
   21,404.22 : 32,063.24 = 9,990 : x
2. Step 2: Convert to fraction form
   21,404.22/32,063.24 = 9,990/x
3. Step 3: Cross multiply
   21,404.22x = 32,063.24 × 9,990
4. Step 4: Simplify right side
   21,404.22x = 320,311,792.58
5. Step 5: Solve for x
   x = 320,311,792.58/21,404.22
6. Step 6: Final answer
   x = 14,964.89