Finding the Third Proportional to 1,215,617 and 2,645,290

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215,617 : 2,645,290 = 2,645,290 : x
2. Step 2: Convert to fraction form
   1,215,617/2,645,290 = 2,645,290/x
3. Step 3: Cross multiply
   1,215,617x = 2,645,290 × 2,645,290
4. Step 4: Simplify right side
   1,215,617x = 6,997,559,184,100
5. Step 5: Solve for x
   x = 6,997,559,184,100/1,215,617
6. Step 6: Final answer
   x = 5,756,384.77