Finding the Third Proportional to 42,931.50 and 65,671.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,931.50 : 65,671.50 = 65,671.50 : x
2. Step 2: Convert to fraction form
   42,931.50/65,671.50 = 65,671.50/x
3. Step 3: Cross multiply
   42,931.50x = 65,671.50 × 65,671.50
4. Step 4: Simplify right side
   42,931.50x = 4,312,745,912.25
5. Step 5: Solve for x
   x = 4,312,745,912.25/42,931.50
6. Step 6: Final answer
   x = 100,456.45