Finding the Third Proportional to 1,939,838 and 4,215,400

Step by Step Solution

1. Step 1: Write the proportion equation
   1,939,838 : 4,215,400 = 4,215,400 : x
2. Step 2: Convert to fraction form
   1,939,838/4,215,400 = 4,215,400/x
3. Step 3: Cross multiply
   1,939,838x = 4,215,400 × 4,215,400
4. Step 4: Simplify right side
   1,939,838x = 17,769,597,160,000
5. Step 5: Solve for x
   x = 17,769,597,160,000/1,939,838
6. Step 6: Final answer
   x = 9,160,351.10