Finding the Third Proportional to 138,208 and 303,200

Step by Step Solution

1. Step 1: Write the proportion equation
   138,208 : 303,200 = 303,200 : x
2. Step 2: Convert to fraction form
   138,208/303,200 = 303,200/x
3. Step 3: Cross multiply
   138,208x = 303,200 × 303,200
4. Step 4: Simplify right side
   138,208x = 91,930,240,000
5. Step 5: Solve for x
   x = 91,930,240,000/138,208
6. Step 6: Final answer
   x = 665,158.60