Finding the Third Proportional to 487,612.50 and 647,010

Step by Step Solution

1. Step 1: Write the proportion equation
   487,612.50 : 647,010 = 647,010 : x
2. Step 2: Convert to fraction form
   487,612.50/647,010 = 647,010/x
3. Step 3: Cross multiply
   487,612.50x = 647,010 × 647,010
4. Step 4: Simplify right side
   487,612.50x = 418,621,940,100
5. Step 5: Solve for x
   x = 418,621,940,100/487,612.50
6. Step 6: Final answer
   x = 858,513.55