Finding the Third Proportional to 644,698.50 and 872,454

Step by Step Solution

1. Step 1: Write the proportion equation
   644,698.50 : 872,454 = 872,454 : x
2. Step 2: Convert to fraction form
   644,698.50/872,454 = 872,454/x
3. Step 3: Cross multiply
   644,698.50x = 872,454 × 872,454
4. Step 4: Simplify right side
   644,698.50x = 761,175,982,116
5. Step 5: Solve for x
   x = 761,175,982,116/644,698.50
6. Step 6: Final answer
   x = 1,180,669.70