Finding the Third Proportional to 12,865.50 and 31,151.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,865.50 : 31,151.25 = 31,151.25 : x
2. Step 2: Convert to fraction form
   12,865.50/31,151.25 = 31,151.25/x
3. Step 3: Cross multiply
   12,865.50x = 31,151.25 × 31,151.25
4. Step 4: Simplify right side
   12,865.50x = 970,400,376.56
5. Step 5: Solve for x
   x = 970,400,376.56/12,865.50
6. Step 6: Final answer
   x = 75,426.56