Finding the Fourth Proportional to 80,425.24, 120,514.81 and 42,990.62

Step by Step Solution

1. Step 1: Write the proportion equation
   80,425.24 : 120,514.81 = 42,990.62 : x
2. Step 2: Convert to fraction form
   80,425.24/120,514.81 = 42,990.62/x
3. Step 3: Cross multiply
   80,425.24x = 120,514.81 × 42,990.62
4. Step 4: Simplify right side
   80,425.24x = 5,181,006,401.08
5. Step 5: Solve for x
   x = 5,181,006,401.08/80,425.24
6. Step 6: Final answer
   x = 64,420.15