Finding the Third Proportional to 395,439 and 612,819.50

Step by Step Solution

1. Step 1: Write the proportion equation
   395,439 : 612,819.50 = 612,819.50 : x
2. Step 2: Convert to fraction form
   395,439/612,819.50 = 612,819.50/x
3. Step 3: Cross multiply
   395,439x = 612,819.50 × 612,819.50
4. Step 4: Simplify right side
   395,439x = 375,547,739,580.25
5. Step 5: Solve for x
   x = 375,547,739,580.25/395,439
6. Step 6: Final answer
   x = 949,698.28