Finding the Third Proportional to 31,945.75 and 67,989.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,945.75 : 67,989.50 = 67,989.50 : x
2. Step 2: Convert to fraction form
   31,945.75/67,989.50 = 67,989.50/x
3. Step 3: Cross multiply
   31,945.75x = 67,989.50 × 67,989.50
4. Step 4: Simplify right side
   31,945.75x = 4,622,572,110.25
5. Step 5: Solve for x
   x = 4,622,572,110.25/31,945.75
6. Step 6: Final answer
   x = 144,700.69