Finding the Third Proportional to 31,081.75 and 67,856.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,081.75 : 67,856.75 = 67,856.75 : x
2. Step 2: Convert to fraction form
   31,081.75/67,856.75 = 67,856.75/x
3. Step 3: Cross multiply
   31,081.75x = 67,856.75 × 67,856.75
4. Step 4: Simplify right side
   31,081.75x = 4,604,538,520.56
5. Step 5: Solve for x
   x = 4,604,538,520.56/31,081.75
6. Step 6: Final answer
   x = 148,142.83