Finding the Third Proportional to 517,809 and 699,592.50

Step by Step Solution

1. Step 1: Write the proportion equation
   517,809 : 699,592.50 = 699,592.50 : x
2. Step 2: Convert to fraction form
   517,809/699,592.50 = 699,592.50/x
3. Step 3: Cross multiply
   517,809x = 699,592.50 × 699,592.50
4. Step 4: Simplify right side
   517,809x = 489,429,666,056.25
5. Step 5: Solve for x
   x = 489,429,666,056.25/517,809
6. Step 6: Final answer
   x = 945,193.43