Finding the Fourth Proportional to 21,645, 32,470.56 and 8,490.24

Step by Step Solution

1. Step 1: Write the proportion equation
   21,645 : 32,470.56 = 8,490.24 : x
2. Step 2: Convert to fraction form
   21,645/32,470.56 = 8,490.24/x
3. Step 3: Cross multiply
   21,645x = 32,470.56 × 8,490.24
4. Step 4: Simplify right side
   21,645x = 275,682,847.33
5. Step 5: Solve for x
   x = 275,682,847.33/21,645
6. Step 6: Final answer
   x = 12,736.56