Finding the Third Proportional to 123,610 and 287,560

Step by Step Solution

1. Step 1: Write the proportion equation
   123,610 : 287,560 = 287,560 : x
2. Step 2: Convert to fraction form
   123,610/287,560 = 287,560/x
3. Step 3: Cross multiply
   123,610x = 287,560 × 287,560
4. Step 4: Simplify right side
   123,610x = 82,690,753,600
5. Step 5: Solve for x
   x = 82,690,753,600/123,610
6. Step 6: Final answer
   x = 668,964.92