Finding the Fourth Proportional to 42,459.76, 63,698.82 and 12,879.85

Step by Step Solution

1. Step 1: Write the proportion equation
   42,459.76 : 63,698.82 = 12,879.85 : x
2. Step 2: Convert to fraction form
   42,459.76/63,698.82 = 12,879.85/x
3. Step 3: Cross multiply
   42,459.76x = 63,698.82 × 12,879.85
4. Step 4: Simplify right side
   42,459.76x = 820,431,246.78
5. Step 5: Solve for x
   x = 820,431,246.78/42,459.76
6. Step 6: Final answer
   x = 19,322.56