Finding the Third Proportional to 31,615.50 and 68,808.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,615.50 : 68,808.75 = 68,808.75 : x
2. Step 2: Convert to fraction form
   31,615.50/68,808.75 = 68,808.75/x
3. Step 3: Cross multiply
   31,615.50x = 68,808.75 × 68,808.75
4. Step 4: Simplify right side
   31,615.50x = 4,734,644,076.56
5. Step 5: Solve for x
   x = 4,734,644,076.56/31,615.50
6. Step 6: Final answer
   x = 149,757.05