Finding the Third Proportional to 21,160 and 29,900

Step by Step Solution

1. Step 1: Write the proportion equation
   21,160 : 29,900 = 29,900 : x
2. Step 2: Convert to fraction form
   21,160/29,900 = 29,900/x
3. Step 3: Cross multiply
   21,160x = 29,900 × 29,900
4. Step 4: Simplify right side
   21,160x = 894,010,000
5. Step 5: Solve for x
   x = 894,010,000/21,160
6. Step 6: Final answer
   x = 42,250