Finding the Fourth Proportional to 80,353.12, 120,455.86 and 42,939.02

Step by Step Solution

1. Step 1: Write the proportion equation
   80,353.12 : 120,455.86 = 42,939.02 : x
2. Step 2: Convert to fraction form
   80,353.12/120,455.86 = 42,939.02/x
3. Step 3: Cross multiply
   80,353.12x = 120,455.86 × 42,939.02
4. Step 4: Simplify right side
   80,353.12x = 5,172,256,581.66
5. Step 5: Solve for x
   x = 5,172,256,581.66/80,353.12
6. Step 6: Final answer
   x = 64,369.08