Finding the Third Proportional to 1,919,628 and 4,200,840

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919,628 : 4,200,840 = 4,200,840 : x
2. Step 2: Convert to fraction form
   1,919,628/4,200,840 = 4,200,840/x
3. Step 3: Cross multiply
   1,919,628x = 4,200,840 × 4,200,840
4. Step 4: Simplify right side
   1,919,628x = 17,647,056,705,600
5. Step 5: Solve for x
   x = 17,647,056,705,600/1,919,628
6. Step 6: Final answer
   x = 9,192,956.50