Finding the Third Proportional to 407,117 and 870,142

Step by Step Solution

1. Step 1: Write the proportion equation
   407,117 : 870,142 = 870,142 : x
2. Step 2: Convert to fraction form
   407,117/870,142 = 870,142/x
3. Step 3: Cross multiply
   407,117x = 870,142 × 870,142
4. Step 4: Simplify right side
   407,117x = 757,147,100,164
5. Step 5: Solve for x
   x = 757,147,100,164/407,117
6. Step 6: Final answer
   x = 1,859,777.66