Finding the Third Proportional to 31,390.75 and 67,760.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,390.75 : 67,760.75 = 67,760.75 : x
2. Step 2: Convert to fraction form
   31,390.75/67,760.75 = 67,760.75/x
3. Step 3: Cross multiply
   31,390.75x = 67,760.75 × 67,760.75
4. Step 4: Simplify right side
   31,390.75x = 4,591,519,240.56
5. Step 5: Solve for x
   x = 4,591,519,240.56/31,390.75
6. Step 6: Final answer
   x = 146,269.82