Finding the Fourth Proportional to 13,306.91, 19,962.36 and 3,945.83

Step by Step Solution

1. Step 1: Write the proportion equation
   13,306.91 : 19,962.36 = 3,945.83 : x
2. Step 2: Convert to fraction form
   13,306.91/19,962.36 = 3,945.83/x
3. Step 3: Cross multiply
   13,306.91x = 19,962.36 × 3,945.83
4. Step 4: Simplify right side
   13,306.91x = 78,767,987.80
5. Step 5: Solve for x
   x = 78,767,987.80/13,306.91
6. Step 6: Final answer
   x = 5,919.33