Finding the Third Proportional to 1,215,186 and 1,366,089

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215,186 : 1,366,089 = 1,366,089 : x
2. Step 2: Convert to fraction form
   1,215,186/1,366,089 = 1,366,089/x
3. Step 3: Cross multiply
   1,215,186x = 1,366,089 × 1,366,089
4. Step 4: Simplify right side
   1,215,186x = 1,866,199,155,921
5. Step 5: Solve for x
   x = 1,866,199,155,921/1,215,186
6. Step 6: Final answer
   x = 1,535,731.28