Finding the Fourth Proportional to 12,739.62, 19,112.69 and 3,974.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,739.62 : 19,112.69 = 3,974.61 : x
2. Step 2: Convert to fraction form
   12,739.62/19,112.69 = 3,974.61/x
3. Step 3: Cross multiply
   12,739.62x = 19,112.69 × 3,974.61
4. Step 4: Simplify right side
   12,739.62x = 75,965,488.80
5. Step 5: Solve for x
   x = 75,965,488.80/12,739.62
6. Step 6: Final answer
   x = 5,962.93