Finding the Third Proportional to 5,178,784 and 7,840,142

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178,784 : 7,840,142 = 7,840,142 : x
2. Step 2: Convert to fraction form
   5,178,784/7,840,142 = 7,840,142/x
3. Step 3: Cross multiply
   5,178,784x = 7,840,142 × 7,840,142
4. Step 4: Simplify right side
   5,178,784x = 61,467,826,580,164
5. Step 5: Solve for x
   x = 61,467,826,580,164/5,178,784
6. Step 6: Final answer
   x = 11,869,162.06