Finding the Third Proportional to 136,440 and 287,019

Step by Step Solution

1. Step 1: Write the proportion equation
   136,440 : 287,019 = 287,019 : x
2. Step 2: Convert to fraction form
   136,440/287,019 = 287,019/x
3. Step 3: Cross multiply
   136,440x = 287,019 × 287,019
4. Step 4: Simplify right side
   136,440x = 82,379,906,361
5. Step 5: Solve for x
   x = 82,379,906,361/136,440
6. Step 6: Final answer
   x = 603,781.20