Finding the Fourth Proportional to 42,480.96, 63,663.12 and 21,660.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,480.96 : 63,663.12 = 21,660.72 : x
2. Step 2: Convert to fraction form
   42,480.96/63,663.12 = 21,660.72/x
3. Step 3: Cross multiply
   42,480.96x = 63,663.12 × 21,660.72
4. Step 4: Simplify right side
   42,480.96x = 1,378,989,016.65
5. Step 5: Solve for x
   x = 1,378,989,016.65/42,480.96
6. Step 6: Final answer
   x = 32,461.34