Finding the Third Proportional to 131,470 and 287,258

Step by Step Solution

1. Step 1: Write the proportion equation
   131,470 : 287,258 = 287,258 : x
2. Step 2: Convert to fraction form
   131,470/287,258 = 287,258/x
3. Step 3: Cross multiply
   131,470x = 287,258 × 287,258
4. Step 4: Simplify right side
   131,470x = 82,517,158,564
5. Step 5: Solve for x
   x = 82,517,158,564/131,470
6. Step 6: Final answer
   x = 627,650.10