Finding the Third Proportional to 131,470 and 287,818

Step by Step Solution

1. Step 1: Write the proportion equation
   131,470 : 287,818 = 287,818 : x
2. Step 2: Convert to fraction form
   131,470/287,818 = 287,818/x
3. Step 3: Cross multiply
   131,470x = 287,818 × 287,818
4. Step 4: Simplify right side
   131,470x = 82,839,201,124
5. Step 5: Solve for x
   x = 82,839,201,124/131,470
6. Step 6: Final answer
   x = 630,099.65