Finding the Third Proportional to 128,196 and 279,612

Step by Step Solution

1. Step 1: Write the proportion equation
   128,196 : 279,612 = 279,612 : x
2. Step 2: Convert to fraction form
   128,196/279,612 = 279,612/x
3. Step 3: Cross multiply
   128,196x = 279,612 × 279,612
4. Step 4: Simplify right side
   128,196x = 78,182,870,544
5. Step 5: Solve for x
   x = 78,182,870,544/128,196
6. Step 6: Final answer
   x = 609,869.81