Finding the Third Proportional to 1,212,615 and 2,640,513

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212,615 : 2,640,513 = 2,640,513 : x
2. Step 2: Convert to fraction form
   1,212,615/2,640,513 = 2,640,513/x
3. Step 3: Cross multiply
   1,212,615x = 2,640,513 × 2,640,513
4. Step 4: Simplify right side
   1,212,615x = 6,972,308,903,169
5. Step 5: Solve for x
   x = 6,972,308,903,169/1,212,615
6. Step 6: Final answer
   x = 5,749,812.52