Finding the Third Proportional to 21,280 and 43,136

Step by Step Solution

1. Step 1: Write the proportion equation
   21,280 : 43,136 = 43,136 : x
2. Step 2: Convert to fraction form
   21,280/43,136 = 43,136/x
3. Step 3: Cross multiply
   21,280x = 43,136 × 43,136
4. Step 4: Simplify right side
   21,280x = 1,860,714,496
5. Step 5: Solve for x
   x = 1,860,714,496/21,280
6. Step 6: Final answer
   x = 87,439.59