Finding the Third Proportional to 127,490 and 287,045

Step by Step Solution

1. Step 1: Write the proportion equation
   127,490 : 287,045 = 287,045 : x
2. Step 2: Convert to fraction form
   127,490/287,045 = 287,045/x
3. Step 3: Cross multiply
   127,490x = 287,045 × 287,045
4. Step 4: Simplify right side
   127,490x = 82,394,832,025
5. Step 5: Solve for x
   x = 82,394,832,025/127,490
6. Step 6: Final answer
   x = 646,284.67