Finding the Third Proportional to 146,908 and 318,240

Step by Step Solution

1. Step 1: Write the proportion equation
   146,908 : 318,240 = 318,240 : x
2. Step 2: Convert to fraction form
   146,908/318,240 = 318,240/x
3. Step 3: Cross multiply
   146,908x = 318,240 × 318,240
4. Step 4: Simplify right side
   146,908x = 101,276,697,600
5. Step 5: Solve for x
   x = 101,276,697,600/146,908
6. Step 6: Final answer
   x = 689,388.58