Finding the Third Proportional to 128,059,872 and 280,404,192

Step by Step Solution

1. Step 1: Write the proportion equation
   128,059,872 : 280,404,192 = 280,404,192 : x
2. Step 2: Convert to fraction form
   128,059,872/280,404,192 = 280,404,192/x
3. Step 3: Cross multiply
   128,059,872x = 280,404,192 × 280,404,192
4. Step 4: Simplify right side
   128,059,872x = 78,626,510,891,172,864
5. Step 5: Solve for x
   x = 78,626,510,891,172,864/128,059,872
6. Step 6: Final answer
   x = 613,982,426.06