Finding the Fourth Proportional to 13,271.57, 19,908.30 and 3,911.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,271.57 : 19,908.30 = 3,911.48 : x
2. Step 2: Convert to fraction form
   13,271.57/19,908.30 = 3,911.48/x
3. Step 3: Cross multiply
   13,271.57x = 19,908.30 × 3,911.48
4. Step 4: Simplify right side
   13,271.57x = 77,870,917.28
5. Step 5: Solve for x
   x = 77,870,917.28/13,271.57
6. Step 6: Final answer
   x = 5,867.50