Finding the Third Proportional to 127,488 and 287,040

Step by Step Solution

1. Step 1: Write the proportion equation
   127,488 : 287,040 = 287,040 : x
2. Step 2: Convert to fraction form
   127,488/287,040 = 287,040/x
3. Step 3: Cross multiply
   127,488x = 287,040 × 287,040
4. Step 4: Simplify right side
   127,488x = 82,391,961,600
5. Step 5: Solve for x
   x = 82,391,961,600/127,488
6. Step 6: Final answer
   x = 646,272.29