Finding the Third Proportional to 276,612 and 427,200

Step by Step Solution

1. Step 1: Write the proportion equation
   276,612 : 427,200 = 427,200 : x
2. Step 2: Convert to fraction form
   276,612/427,200 = 427,200/x
3. Step 3: Cross multiply
   276,612x = 427,200 × 427,200
4. Step 4: Simplify right side
   276,612x = 182,499,840,000
5. Step 5: Solve for x
   x = 182,499,840,000/276,612
6. Step 6: Final answer
   x = 659,768.34