Finding the Third Proportional to 2,870,440 and 3,900,009

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870,440 : 3,900,009 = 3,900,009 : x
2. Step 2: Convert to fraction form
   2,870,440/3,900,009 = 3,900,009/x
3. Step 3: Cross multiply
   2,870,440x = 3,900,009 × 3,900,009
4. Step 4: Simplify right side
   2,870,440x = 15,210,070,200,081
5. Step 5: Solve for x
   x = 15,210,070,200,081/2,870,440
6. Step 6: Final answer
   x = 5,298,863.66