Finding the Third Proportional to 487,710 and 647,304.75

Step by Step Solution

1. Step 1: Write the proportion equation
   487,710 : 647,304.75 = 647,304.75 : x
2. Step 2: Convert to fraction form
   487,710/647,304.75 = 647,304.75/x
3. Step 3: Cross multiply
   487,710x = 647,304.75 × 647,304.75
4. Step 4: Simplify right side
   487,710x = 419,003,439,372.56
5. Step 5: Solve for x
   x = 419,003,439,372.56/487,710
6. Step 6: Final answer
   x = 859,124.15