Finding the Third Proportional to 31,280 and 65,148.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,280 : 65,148.75 = 65,148.75 : x
2. Step 2: Convert to fraction form
   31,280/65,148.75 = 65,148.75/x
3. Step 3: Cross multiply
   31,280x = 65,148.75 × 65,148.75
4. Step 4: Simplify right side
   31,280x = 4,244,359,626.56
5. Step 5: Solve for x
   x = 4,244,359,626.56/31,280
6. Step 6: Final answer
   x = 135,689.25