Finding the Third Proportional to 131,989.50 and 287,806.50

Step by Step Solution

1. Step 1: Write the proportion equation
   131,989.50 : 287,806.50 = 287,806.50 : x
2. Step 2: Convert to fraction form
   131,989.50/287,806.50 = 287,806.50/x
3. Step 3: Cross multiply
   131,989.50x = 287,806.50 × 287,806.50
4. Step 4: Simplify right side
   131,989.50x = 82,832,581,442.25
5. Step 5: Solve for x
   x = 82,832,581,442.25/131,989.50
6. Step 6: Final answer
   x = 627,569.48