Finding the Third Proportional to 401,715,958 and 870,469,128

Step by Step Solution

1. Step 1: Write the proportion equation
   401,715,958 : 870,469,128 = 870,469,128 : x
2. Step 2: Convert to fraction form
   401,715,958/870,469,128 = 870,469,128/x
3. Step 3: Cross multiply
   401,715,958x = 870,469,128 × 870,469,128
4. Step 4: Simplify right side
   401,715,958x = 757,716,502,801,080,320
5. Step 5: Solve for x
   x = 757,716,502,801,080,320/401,715,958
6. Step 6: Final answer
   x = 1,886,199,658.52