Finding the Third Proportional to 31,918.88 and 67,872.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,918.88 : 67,872.75 = 67,872.75 : x
2. Step 2: Convert to fraction form
   31,918.88/67,872.75 = 67,872.75/x
3. Step 3: Cross multiply
   31,918.88x = 67,872.75 × 67,872.75
4. Step 4: Simplify right side
   31,918.88x = 4,606,710,192.56
5. Step 5: Solve for x
   x = 4,606,710,192.56/31,918.88
6. Step 6: Final answer
   x = 144,325.58