Finding the Third Proportional to 864,403 and 1,268,578

Step by Step Solution

1. Step 1: Write the proportion equation
   864,403 : 1,268,578 = 1,268,578 : x
2. Step 2: Convert to fraction form
   864,403/1,268,578 = 1,268,578/x
3. Step 3: Cross multiply
   864,403x = 1,268,578 × 1,268,578
4. Step 4: Simplify right side
   864,403x = 1,609,290,142,084
5. Step 5: Solve for x
   x = 1,609,290,142,084/864,403
6. Step 6: Final answer
   x = 1,861,735.95