Finding the Fourth Proportional to 42,561.92, 63,842.71 and 12,979.67

Step by Step Solution

1. Step 1: Write the proportion equation
   42,561.92 : 63,842.71 = 12,979.67 : x
2. Step 2: Convert to fraction form
   42,561.92/63,842.71 = 12,979.67/x
3. Step 3: Cross multiply
   42,561.92x = 63,842.71 × 12,979.67
4. Step 4: Simplify right side
   42,561.92x = 828,657,434.86
5. Step 5: Solve for x
   x = 828,657,434.86/42,561.92
6. Step 6: Final answer
   x = 19,469.46