Finding the Fourth Proportional to 42,019.02, 63,029.18 and 12,439.85

Step by Step Solution

1. Step 1: Write the proportion equation
   42,019.02 : 63,029.18 = 12,439.85 : x
2. Step 2: Convert to fraction form
   42,019.02/63,029.18 = 12,439.85/x
3. Step 3: Cross multiply
   42,019.02x = 63,029.18 × 12,439.85
4. Step 4: Simplify right side
   42,019.02x = 784,073,260.78
5. Step 5: Solve for x
   x = 784,073,260.78/42,019.02
6. Step 6: Final answer
   x = 18,659.96