Finding the Third Proportional to 68,280 and 142,992

Step by Step Solution

1. Step 1: Write the proportion equation
   68,280 : 142,992 = 142,992 : x
2. Step 2: Convert to fraction form
   68,280/142,992 = 142,992/x
3. Step 3: Cross multiply
   68,280x = 142,992 × 142,992
4. Step 4: Simplify right side
   68,280x = 20,446,712,064
5. Step 5: Solve for x
   x = 20,446,712,064/68,280
6. Step 6: Final answer
   x = 299,453.90