Finding the Third Proportional to 31,018.50 and 66,408.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,018.50 : 66,408.75 = 66,408.75 : x
2. Step 2: Convert to fraction form
   31,018.50/66,408.75 = 66,408.75/x
3. Step 3: Cross multiply
   31,018.50x = 66,408.75 × 66,408.75
4. Step 4: Simplify right side
   31,018.50x = 4,410,122,076.56
5. Step 5: Solve for x
   x = 4,410,122,076.56/31,018.50
6. Step 6: Final answer
   x = 142,177.15