Finding the Third Proportional to 407,115 and 870,137.25

Step by Step Solution

1. Step 1: Write the proportion equation
   407,115 : 870,137.25 = 870,137.25 : x
2. Step 2: Convert to fraction form
   407,115/870,137.25 = 870,137.25/x
3. Step 3: Cross multiply
   407,115x = 870,137.25 × 870,137.25
4. Step 4: Simplify right side
   407,115x = 757,138,833,837.56
5. Step 5: Solve for x
   x = 757,138,833,837.56/407,115
6. Step 6: Final answer
   x = 1,859,766.49