Finding the Third Proportional to 311,580 and 675,648

Step by Step Solution

1. Step 1: Write the proportion equation
   311,580 : 675,648 = 675,648 : x
2. Step 2: Convert to fraction form
   311,580/675,648 = 675,648/x
3. Step 3: Cross multiply
   311,580x = 675,648 × 675,648
4. Step 4: Simplify right side
   311,580x = 456,500,219,904
5. Step 5: Solve for x
   x = 456,500,219,904/311,580
6. Step 6: Final answer
   x = 1,465,114.00