Finding the Third Proportional to 288,351 and 630,986.06

Step by Step Solution

1. Step 1: Write the proportion equation
   288,351 : 630,986.06 = 630,986.06 : x
2. Step 2: Convert to fraction form
   288,351/630,986.06 = 630,986.06/x
3. Step 3: Cross multiply
   288,351x = 630,986.06 × 630,986.06
4. Step 4: Simplify right side
   288,351x = 398,143,411,069.25
5. Step 5: Solve for x
   x = 398,143,411,069.25/288,351
6. Step 6: Final answer
   x = 1,380,759.60