Finding the Third Proportional to 396,615 and 604,216.50

Step by Step Solution

1. Step 1: Write the proportion equation
   396,615 : 604,216.50 = 604,216.50 : x
2. Step 2: Convert to fraction form
   396,615/604,216.50 = 604,216.50/x
3. Step 3: Cross multiply
   396,615x = 604,216.50 × 604,216.50
4. Step 4: Simplify right side
   396,615x = 365,077,578,872.25
5. Step 5: Solve for x
   x = 365,077,578,872.25/396,615
6. Step 6: Final answer
   x = 920,483.54