Finding the Third Proportional to 133,980 and 287,388

Step by Step Solution

1. Step 1: Write the proportion equation
   133,980 : 287,388 = 287,388 : x
2. Step 2: Convert to fraction form
   133,980/287,388 = 287,388/x
3. Step 3: Cross multiply
   133,980x = 287,388 × 287,388
4. Step 4: Simplify right side
   133,980x = 82,591,862,544
5. Step 5: Solve for x
   x = 82,591,862,544/133,980
6. Step 6: Final answer
   x = 616,449.19