Finding the Fourth Proportional to 80,109.08, 120,235.85 and 42,700.31

Step by Step Solution

1. Step 1: Write the proportion equation
   80,109.08 : 120,235.85 = 42,700.31 : x
2. Step 2: Convert to fraction form
   80,109.08/120,235.85 = 42,700.31/x
3. Step 3: Cross multiply
   80,109.08x = 120,235.85 × 42,700.31
4. Step 4: Simplify right side
   80,109.08x = 5,134,107,854.61
5. Step 5: Solve for x
   x = 5,134,107,854.61/80,109.08
6. Step 6: Final answer
   x = 64,088.96