Finding the Third Proportional to 131,490 and 287,859

Step by Step Solution

1. Step 1: Write the proportion equation
   131,490 : 287,859 = 287,859 : x
2. Step 2: Convert to fraction form
   131,490/287,859 = 287,859/x
3. Step 3: Cross multiply
   131,490x = 287,859 × 287,859
4. Step 4: Simplify right side
   131,490x = 82,862,803,881
5. Step 5: Solve for x
   x = 82,862,803,881/131,490
6. Step 6: Final answer
   x = 630,183.31