Finding the Third Proportional to 31,218.50 and 66,903.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,218.50 : 66,903.25 = 66,903.25 : x
2. Step 2: Convert to fraction form
   31,218.50/66,903.25 = 66,903.25/x
3. Step 3: Cross multiply
   31,218.50x = 66,903.25 × 66,903.25
4. Step 4: Simplify right side
   31,218.50x = 4,476,044,860.56
5. Step 5: Solve for x
   x = 4,476,044,860.56/31,218.50
6. Step 6: Final answer
   x = 143,377.96