Finding the Third Proportional to 31,218.75 and 68,276.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,218.75 : 68,276.25 = 68,276.25 : x
2. Step 2: Convert to fraction form
   31,218.75/68,276.25 = 68,276.25/x
3. Step 3: Cross multiply
   31,218.75x = 68,276.25 × 68,276.25
4. Step 4: Simplify right side
   31,218.75x = 4,661,646,314.06
5. Step 5: Solve for x
   x = 4,661,646,314.06/31,218.75
6. Step 6: Final answer
   x = 149,322.00