Finding the Third Proportional to 31,119.75 and 68,287.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,119.75 : 68,287.50 = 68,287.50 : x
2. Step 2: Convert to fraction form
   31,119.75/68,287.50 = 68,287.50/x
3. Step 3: Cross multiply
   31,119.75x = 68,287.50 × 68,287.50
4. Step 4: Simplify right side
   31,119.75x = 4,663,182,656.25
5. Step 5: Solve for x
   x = 4,663,182,656.25/31,119.75
6. Step 6: Final answer
   x = 149,846.40