Finding the Third Proportional to 78,928 and 173,136

Step by Step Solution

1. Step 1: Write the proportion equation
   78,928 : 173,136 = 173,136 : x
2. Step 2: Convert to fraction form
   78,928/173,136 = 173,136/x
3. Step 3: Cross multiply
   78,928x = 173,136 × 173,136
4. Step 4: Simplify right side
   78,928x = 29,976,074,496
5. Step 5: Solve for x
   x = 29,976,074,496/78,928
6. Step 6: Final answer
   x = 379,790.12