Finding the Third Proportional to 31,230.50 and 65,724.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,230.50 : 65,724.50 = 65,724.50 : x
2. Step 2: Convert to fraction form
   31,230.50/65,724.50 = 65,724.50/x
3. Step 3: Cross multiply
   31,230.50x = 65,724.50 × 65,724.50
4. Step 4: Simplify right side
   31,230.50x = 4,319,709,900.25
5. Step 5: Solve for x
   x = 4,319,709,900.25/31,230.50
6. Step 6: Final answer
   x = 138,317.03