Finding the Third Proportional to 31,242.75 and 67,406.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,242.75 : 67,406.25 = 67,406.25 : x
2. Step 2: Convert to fraction form
   31,242.75/67,406.25 = 67,406.25/x
3. Step 3: Cross multiply
   31,242.75x = 67,406.25 × 67,406.25
4. Step 4: Simplify right side
   31,242.75x = 4,543,602,539.06
5. Step 5: Solve for x
   x = 4,543,602,539.06/31,242.75
6. Step 6: Final answer
   x = 145,429.02