Finding the Third Proportional to 391,813 and 581,959.50

Step by Step Solution

1. Step 1: Write the proportion equation
   391,813 : 581,959.50 = 581,959.50 : x
2. Step 2: Convert to fraction form
   391,813/581,959.50 = 581,959.50/x
3. Step 3: Cross multiply
   391,813x = 581,959.50 × 581,959.50
4. Step 4: Simplify right side
   391,813x = 338,676,859,640.25
5. Step 5: Solve for x
   x = 338,676,859,640.25/391,813
6. Step 6: Final answer
   x = 864,383.93