Finding the Third Proportional to 128,361.38 and 279,288

Step by Step Solution

1. Step 1: Write the proportion equation
   128,361.38 : 279,288 = 279,288 : x
2. Step 2: Convert to fraction form
   128,361.38/279,288 = 279,288/x
3. Step 3: Cross multiply
   128,361.38x = 279,288 × 279,288
4. Step 4: Simplify right side
   128,361.38x = 78,001,786,944
5. Step 5: Solve for x
   x = 78,001,786,944/128,361.38
6. Step 6: Final answer
   x = 607,673.35