Finding the Third Proportional to 21,280 and 43,168

Step by Step Solution

1. Step 1: Write the proportion equation
   21,280 : 43,168 = 43,168 : x
2. Step 2: Convert to fraction form
   21,280/43,168 = 43,168/x
3. Step 3: Cross multiply
   21,280x = 43,168 × 43,168
4. Step 4: Simplify right side
   21,280x = 1,863,476,224
5. Step 5: Solve for x
   x = 1,863,476,224/21,280
6. Step 6: Final answer
   x = 87,569.37