Finding the Third Proportional to 31,718.25 and 68,902.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,718.25 : 68,902.31 = 68,902.31 : x
2. Step 2: Convert to fraction form
   31,718.25/68,902.31 = 68,902.31/x
3. Step 3: Cross multiply
   31,718.25x = 68,902.31 × 68,902.31
4. Step 4: Simplify right side
   31,718.25x = 4,747,528,667.85
5. Step 5: Solve for x
   x = 4,747,528,667.85/31,718.25
6. Step 6: Final answer
   x = 149,678.14