Finding the Third Proportional to 4,186,518 and 8,978,784

Step by Step Solution

1. Step 1: Write the proportion equation
   4,186,518 : 8,978,784 = 8,978,784 : x
2. Step 2: Convert to fraction form
   4,186,518/8,978,784 = 8,978,784/x
3. Step 3: Cross multiply
   4,186,518x = 8,978,784 × 8,978,784
4. Step 4: Simplify right side
   4,186,518x = 80,618,562,118,656
5. Step 5: Solve for x
   x = 80,618,562,118,656/4,186,518
6. Step 6: Final answer
   x = 19,256,709.78