Finding the Third Proportional to 131,811.75 and 287,680.50

Step by Step Solution

1. Step 1: Write the proportion equation
   131,811.75 : 287,680.50 = 287,680.50 : x
2. Step 2: Convert to fraction form
   131,811.75/287,680.50 = 287,680.50/x
3. Step 3: Cross multiply
   131,811.75x = 287,680.50 × 287,680.50
4. Step 4: Simplify right side
   131,811.75x = 82,760,070,080.25
5. Step 5: Solve for x
   x = 82,760,070,080.25/131,811.75
6. Step 6: Final answer
   x = 627,865.65