Finding the Third Proportional to 42,721.50 and 65,758.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,721.50 : 65,758.50 = 65,758.50 : x
2. Step 2: Convert to fraction form
   42,721.50/65,758.50 = 65,758.50/x
3. Step 3: Cross multiply
   42,721.50x = 65,758.50 × 65,758.50
4. Step 4: Simplify right side
   42,721.50x = 4,324,180,322.25
5. Step 5: Solve for x
   x = 4,324,180,322.25/42,721.50
6. Step 6: Final answer
   x = 101,217.90