Finding the Fourth Proportional to 80,111.70, 120,131.10 and 42,662.16

Step by Step Solution

1. Step 1: Write the proportion equation
   80,111.70 : 120,131.10 = 42,662.16 : x
2. Step 2: Convert to fraction form
   80,111.70/120,131.10 = 42,662.16/x
3. Step 3: Cross multiply
   80,111.70x = 120,131.10 × 42,662.16
4. Step 4: Simplify right side
   80,111.70x = 5,125,052,209.18
5. Step 5: Solve for x
   x = 5,125,052,209.18/80,111.70
6. Step 6: Final answer
   x = 63,973.83