Finding the Third Proportional to 278,054 and 611,404

Step by Step Solution

1. Step 1: Write the proportion equation
   278,054 : 611,404 = 611,404 : x
2. Step 2: Convert to fraction form
   278,054/611,404 = 611,404/x
3. Step 3: Cross multiply
   278,054x = 611,404 × 611,404
4. Step 4: Simplify right side
   278,054x = 373,814,851,216
5. Step 5: Solve for x
   x = 373,814,851,216/278,054
6. Step 6: Final answer
   x = 1,344,396.60