Finding the Fourth Proportional to 80,428.50, 120,519.68 and 42,993.88

Step by Step Solution

1. Step 1: Write the proportion equation
   80,428.50 : 120,519.68 = 42,993.88 : x
2. Step 2: Convert to fraction form
   80,428.50/120,519.68 = 42,993.88/x
3. Step 3: Cross multiply
   80,428.50x = 120,519.68 × 42,993.88
4. Step 4: Simplify right side
   80,428.50x = 5,181,608,659.56
5. Step 5: Solve for x
   x = 5,181,608,659.56/80,428.50
6. Step 6: Final answer
   x = 64,425.03