Finding the Fourth Proportional to 12,678.72, 19,019.90 and 3,914.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,678.72 : 19,019.90 = 3,914.38 : x
2. Step 2: Convert to fraction form
   12,678.72/19,019.90 = 3,914.38/x
3. Step 3: Cross multiply
   12,678.72x = 19,019.90 × 3,914.38
4. Step 4: Simplify right side
   12,678.72x = 74,451,116.16
5. Step 5: Solve for x
   x = 74,451,116.16/12,678.72
6. Step 6: Final answer
   x = 5,872.13