Finding the Third Proportional to 66,279 and 139,398

Step by Step Solution

1. Step 1: Write the proportion equation
   66,279 : 139,398 = 139,398 : x
2. Step 2: Convert to fraction form
   66,279/139,398 = 139,398/x
3. Step 3: Cross multiply
   66,279x = 139,398 × 139,398
4. Step 4: Simplify right side
   66,279x = 19,431,802,404
5. Step 5: Solve for x
   x = 19,431,802,404/66,279
6. Step 6: Final answer
   x = 293,181.89