Finding the Third Proportional to 391,959 and 858,640.50

Step by Step Solution

1. Step 1: Write the proportion equation
   391,959 : 858,640.50 = 858,640.50 : x
2. Step 2: Convert to fraction form
   391,959/858,640.50 = 858,640.50/x
3. Step 3: Cross multiply
   391,959x = 858,640.50 × 858,640.50
4. Step 4: Simplify right side
   391,959x = 737,263,508,240.25
5. Step 5: Solve for x
   x = 737,263,508,240.25/391,959
6. Step 6: Final answer
   x = 1,880,970.99