Finding the Third Proportional to 13,856,628 and 21,507,942

Step by Step Solution

1. Step 1: Write the proportion equation
   13,856,628 : 21,507,942 = 21,507,942 : x
2. Step 2: Convert to fraction form
   13,856,628/21,507,942 = 21,507,942/x
3. Step 3: Cross multiply
   13,856,628x = 21,507,942 × 21,507,942
4. Step 4: Simplify right side
   13,856,628x = 462,591,569,075,364
5. Step 5: Solve for x
   x = 462,591,569,075,364/13,856,628
6. Step 6: Final answer
   x = 33,384,137.11