Finding the Third Proportional to 31,359.75 and 67,831.13

Step by Step Solution

1. Step 1: Write the proportion equation
   31,359.75 : 67,831.13 = 67,831.13 : x
2. Step 2: Convert to fraction form
   31,359.75/67,831.13 = 67,831.13/x
3. Step 3: Cross multiply
   31,359.75x = 67,831.13 × 67,831.13
4. Step 4: Simplify right side
   31,359.75x = 4,601,061,518.77
5. Step 5: Solve for x
   x = 4,601,061,518.77/31,359.75
6. Step 6: Final answer
   x = 146,718.69