Finding the Third Proportional to 689,617.50 and 1,361,550

Step by Step Solution

1. Step 1: Write the proportion equation
   689,617.50 : 1,361,550 = 1,361,550 : x
2. Step 2: Convert to fraction form
   689,617.50/1,361,550 = 1,361,550/x
3. Step 3: Cross multiply
   689,617.50x = 1,361,550 × 1,361,550
4. Step 4: Simplify right side
   689,617.50x = 1,853,818,402,500
5. Step 5: Solve for x
   x = 1,853,818,402,500/689,617.50
6. Step 6: Final answer
   x = 2,688,183.53