Finding the Fourth Proportional to 13,271.28, 19,905.20 and 5,479.04

Step by Step Solution

1. Step 1: Write the proportion equation
   13,271.28 : 19,905.20 = 5,479.04 : x
2. Step 2: Convert to fraction form
   13,271.28/19,905.20 = 5,479.04/x
3. Step 3: Cross multiply
   13,271.28x = 19,905.20 × 5,479.04
4. Step 4: Simplify right side
   13,271.28x = 109,061,387.01
5. Step 5: Solve for x
   x = 109,061,387.01/13,271.28
6. Step 6: Final answer
   x = 8,217.85