Finding the Third Proportional to 5,178,930 and 7,840,371

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178,930 : 7,840,371 = 7,840,371 : x
2. Step 2: Convert to fraction form
   5,178,930/7,840,371 = 7,840,371/x
3. Step 3: Cross multiply
   5,178,930x = 7,840,371 × 7,840,371
4. Step 4: Simplify right side
   5,178,930x = 61,471,417,417,641
5. Step 5: Solve for x
   x = 61,471,417,417,641/5,178,930
6. Step 6: Final answer
   x = 11,869,520.81