Finding the Third Proportional to 60,840 and 129,456

Step by Step Solution

1. Step 1: Write the proportion equation
   60,840 : 129,456 = 129,456 : x
2. Step 2: Convert to fraction form
   60,840/129,456 = 129,456/x
3. Step 3: Cross multiply
   60,840x = 129,456 × 129,456
4. Step 4: Simplify right side
   60,840x = 16,758,855,936
5. Step 5: Solve for x
   x = 16,758,855,936/60,840
6. Step 6: Final answer
   x = 275,457.86