Finding the Third Proportional to 396,636.75 and 578,340

Step by Step Solution

1. Step 1: Write the proportion equation
   396,636.75 : 578,340 = 578,340 : x
2. Step 2: Convert to fraction form
   396,636.75/578,340 = 578,340/x
3. Step 3: Cross multiply
   396,636.75x = 578,340 × 578,340
4. Step 4: Simplify right side
   396,636.75x = 334,477,155,600
5. Step 5: Solve for x
   x = 334,477,155,600/396,636.75
6. Step 6: Final answer
   x = 843,283.32