Finding the Third Proportional to 31,428.75 and 67,778.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,428.75 : 67,778.25 = 67,778.25 : x
2. Step 2: Convert to fraction form
   31,428.75/67,778.25 = 67,778.25/x
3. Step 3: Cross multiply
   31,428.75x = 67,778.25 × 67,778.25
4. Step 4: Simplify right side
   31,428.75x = 4,593,891,173.06
5. Step 5: Solve for x
   x = 4,593,891,173.06/31,428.75
6. Step 6: Final answer
   x = 146,168.43