Finding the Third Proportional to 1,215,210 and 2,659,158

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215,210 : 2,659,158 = 2,659,158 : x
2. Step 2: Convert to fraction form
   1,215,210/2,659,158 = 2,659,158/x
3. Step 3: Cross multiply
   1,215,210x = 2,659,158 × 2,659,158
4. Step 4: Simplify right side
   1,215,210x = 7,071,121,268,964
5. Step 5: Solve for x
   x = 7,071,121,268,964/1,215,210
6. Step 6: Final answer
   x = 5,818,847.17