Finding the Third Proportional to 136,760 and 287,340

Step by Step Solution

1. Step 1: Write the proportion equation
   136,760 : 287,340 = 287,340 : x
2. Step 2: Convert to fraction form
   136,760/287,340 = 287,340/x
3. Step 3: Cross multiply
   136,760x = 287,340 × 287,340
4. Step 4: Simplify right side
   136,760x = 82,564,275,600
5. Step 5: Solve for x
   x = 82,564,275,600/136,760
6. Step 6: Final answer
   x = 603,716.55