Finding the Fourth Proportional to 13,271.72, 19,904.39 and 3,909.19

Step by Step Solution

1. Step 1: Write the proportion equation
   13,271.72 : 19,904.39 = 3,909.19 : x
2. Step 2: Convert to fraction form
   13,271.72/19,904.39 = 3,909.19/x
3. Step 3: Cross multiply
   13,271.72x = 19,904.39 × 3,909.19
4. Step 4: Simplify right side
   13,271.72x = 77,810,042.34
5. Step 5: Solve for x
   x = 77,810,042.34/13,271.72
6. Step 6: Final answer
   x = 5,862.85