Finding the Third Proportional to 398,259 and 630,931.50

Step by Step Solution

1. Step 1: Write the proportion equation
   398,259 : 630,931.50 = 630,931.50 : x
2. Step 2: Convert to fraction form
   398,259/630,931.50 = 630,931.50/x
3. Step 3: Cross multiply
   398,259x = 630,931.50 × 630,931.50
4. Step 4: Simplify right side
   398,259x = 398,074,557,692.25
5. Step 5: Solve for x
   x = 398,074,557,692.25/398,259
6. Step 6: Final answer
   x = 999,536.88