Finding the Third Proportional to 517,815 and 699,601.50

Step by Step Solution

1. Step 1: Write the proportion equation
   517,815 : 699,601.50 = 699,601.50 : x
2. Step 2: Convert to fraction form
   517,815/699,601.50 = 699,601.50/x
3. Step 3: Cross multiply
   517,815x = 699,601.50 × 699,601.50
4. Step 4: Simplify right side
   517,815x = 489,442,258,802.25
5. Step 5: Solve for x
   x = 489,442,258,802.25/517,815
6. Step 6: Final answer
   x = 945,206.80