Finding the Third Proportional to 8,315,258 and 12,438,978

Step by Step Solution

1. Step 1: Write the proportion equation
   8,315,258 : 12,438,978 = 12,438,978 : x
2. Step 2: Convert to fraction form
   8,315,258/12,438,978 = 12,438,978/x
3. Step 3: Cross multiply
   8,315,258x = 12,438,978 × 12,438,978
4. Step 4: Simplify right side
   8,315,258x = 154,728,173,684,484
5. Step 5: Solve for x
   x = 154,728,173,684,484/8,315,258
6. Step 6: Final answer
   x = 18,607,741.78