Finding the Third Proportional to 553,263 and 879,739.50

Step by Step Solution

1. Step 1: Write the proportion equation
   553,263 : 879,739.50 = 879,739.50 : x
2. Step 2: Convert to fraction form
   553,263/879,739.50 = 879,739.50/x
3. Step 3: Cross multiply
   553,263x = 879,739.50 × 879,739.50
4. Step 4: Simplify right side
   553,263x = 773,941,587,860.25
5. Step 5: Solve for x
   x = 773,941,587,860.25/553,263
6. Step 6: Final answer
   x = 1,398,867.42