Finding the Third Proportional to 31,351.50 and 67,815.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,351.50 : 67,815.75 = 67,815.75 : x
2. Step 2: Convert to fraction form
   31,351.50/67,815.75 = 67,815.75/x
3. Step 3: Cross multiply
   31,351.50x = 67,815.75 × 67,815.75
4. Step 4: Simplify right side
   31,351.50x = 4,598,975,948.06
5. Step 5: Solve for x
   x = 4,598,975,948.06/31,351.50
6. Step 6: Final answer
   x = 146,690.78