Finding the Third Proportional to 131,387.25 and 288,209.25

Step by Step Solution

1. Step 1: Write the proportion equation
   131,387.25 : 288,209.25 = 288,209.25 : x
2. Step 2: Convert to fraction form
   131,387.25/288,209.25 = 288,209.25/x
3. Step 3: Cross multiply
   131,387.25x = 288,209.25 × 288,209.25
4. Step 4: Simplify right side
   131,387.25x = 83,064,571,785.56
5. Step 5: Solve for x
   x = 83,064,571,785.56/131,387.25
6. Step 6: Final answer
   x = 632,211.81