Finding the Third Proportional to 4,102,840 and 8,928,128

Step by Step Solution

1. Step 1: Write the proportion equation
   4,102,840 : 8,928,128 = 8,928,128 : x
2. Step 2: Convert to fraction form
   4,102,840/8,928,128 = 8,928,128/x
3. Step 3: Cross multiply
   4,102,840x = 8,928,128 × 8,928,128
4. Step 4: Simplify right side
   4,102,840x = 79,711,469,584,384
5. Step 5: Solve for x
   x = 79,711,469,584,384/4,102,840
6. Step 6: Final answer
   x = 19,428,364.15