Finding the Third Proportional to 147,212 and 318,826

Step by Step Solution

1. Step 1: Write the proportion equation
   147,212 : 318,826 = 318,826 : x
2. Step 2: Convert to fraction form
   147,212/318,826 = 318,826/x
3. Step 3: Cross multiply
   147,212x = 318,826 × 318,826
4. Step 4: Simplify right side
   147,212x = 101,650,018,276
5. Step 5: Solve for x
   x = 101,650,018,276/147,212
6. Step 6: Final answer
   x = 690,500.90