Finding the Third Proportional to 5,178,881 and 7,840,280

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178,881 : 7,840,280 = 7,840,280 : x
2. Step 2: Convert to fraction form
   5,178,881/7,840,280 = 7,840,280/x
3. Step 3: Cross multiply
   5,178,881x = 7,840,280 × 7,840,280
4. Step 4: Simplify right side
   5,178,881x = 61,469,990,478,400
5. Step 5: Solve for x
   x = 61,469,990,478,400/5,178,881
6. Step 6: Final answer
   x = 11,869,357.58