Finding the Third Proportional to 31,242.50 and 67,405.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,242.50 : 67,405.75 = 67,405.75 : x
2. Step 2: Convert to fraction form
   31,242.50/67,405.75 = 67,405.75/x
3. Step 3: Cross multiply
   31,242.50x = 67,405.75 × 67,405.75
4. Step 4: Simplify right side
   31,242.50x = 4,543,535,133.06
5. Step 5: Solve for x
   x = 4,543,535,133.06/31,242.50
6. Step 6: Final answer
   x = 145,428.03