Finding the Third Proportional to 2,178,628 and 4,787,312

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178,628 : 4,787,312 = 4,787,312 : x
2. Step 2: Convert to fraction form
   2,178,628/4,787,312 = 4,787,312/x
3. Step 3: Cross multiply
   2,178,628x = 4,787,312 × 4,787,312
4. Step 4: Simplify right side
   2,178,628x = 22,918,356,185,344
5. Step 5: Solve for x
   x = 22,918,356,185,344/2,178,628
6. Step 6: Final answer
   x = 10,519,628.03