Finding the Third Proportional to 5,178,791 and 7,840,155

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178,791 : 7,840,155 = 7,840,155 : x
2. Step 2: Convert to fraction form
   5,178,791/7,840,155 = 7,840,155/x
3. Step 3: Cross multiply
   5,178,791x = 7,840,155 × 7,840,155
4. Step 4: Simplify right side
   5,178,791x = 61,468,030,424,025
5. Step 5: Solve for x
   x = 61,468,030,424,025/5,178,791
6. Step 6: Final answer
   x = 11,869,185.38