Finding the Fourth Proportional to 42,404.24, 63,615.56 and 12,821.32

Step by Step Solution

1. Step 1: Write the proportion equation
   42,404.24 : 63,615.56 = 12,821.32 : x
2. Step 2: Convert to fraction form
   42,404.24/63,615.56 = 12,821.32/x
3. Step 3: Cross multiply
   42,404.24x = 63,615.56 × 12,821.32
4. Step 4: Simplify right side
   42,404.24x = 815,635,451.74
5. Step 5: Solve for x
   x = 815,635,451.74/42,404.24
6. Step 6: Final answer
   x = 19,234.76