Finding the Third Proportional to 1,215,986 and 1,817,172

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215,986 : 1,817,172 = 1,817,172 : x
2. Step 2: Convert to fraction form
   1,215,986/1,817,172 = 1,817,172/x
3. Step 3: Cross multiply
   1,215,986x = 1,817,172 × 1,817,172
4. Step 4: Simplify right side
   1,215,986x = 3,302,114,077,584
5. Step 5: Solve for x
   x = 3,302,114,077,584/1,215,986
6. Step 6: Final answer
   x = 2,715,585.61