Finding the Third Proportional to 1,215,616 and 2,645,288

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215,616 : 2,645,288 = 2,645,288 : x
2. Step 2: Convert to fraction form
   1,215,616/2,645,288 = 2,645,288/x
3. Step 3: Cross multiply
   1,215,616x = 2,645,288 × 2,645,288
4. Step 4: Simplify right side
   1,215,616x = 6,997,548,602,944
5. Step 5: Solve for x
   x = 6,997,548,602,944/1,215,616
6. Step 6: Final answer
   x = 5,756,380.80