Finding the Fourth Proportional to 21,645.52, 32,468.48 and 8,499.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,645.52 : 32,468.48 = 8,499.20 : x
2. Step 2: Convert to fraction form
   21,645.52/32,468.48 = 8,499.20/x
3. Step 3: Cross multiply
   21,645.52x = 32,468.48 × 8,499.20
4. Step 4: Simplify right side
   21,645.52x = 275,956,105.22
5. Step 5: Solve for x
   x = 275,956,105.22/21,645.52
6. Step 6: Final answer
   x = 12,748.88