Finding the Third Proportional to 407,116 and 870,139

Step by Step Solution

1. Step 1: Write the proportion equation
   407,116 : 870,139 = 870,139 : x
2. Step 2: Convert to fraction form
   407,116/870,139 = 870,139/x
3. Step 3: Cross multiply
   407,116x = 870,139 × 870,139
4. Step 4: Simplify right side
   407,116x = 757,141,879,321
5. Step 5: Solve for x
   x = 757,141,879,321/407,116
6. Step 6: Final answer
   x = 1,859,769.40