Finding the Third Proportional to 21,000 and 42,960

Step by Step Solution

1. Step 1: Write the proportion equation
   21,000 : 42,960 = 42,960 : x
2. Step 2: Convert to fraction form
   21,000/42,960 = 42,960/x
3. Step 3: Cross multiply
   21,000x = 42,960 × 42,960
4. Step 4: Simplify right side
   21,000x = 1,845,561,600
5. Step 5: Solve for x
   x = 1,845,561,600/21,000
6. Step 6: Final answer
   x = 87,883.89