Finding the Fourth Proportional to 13,012.72, 19,515.84 and 5,217.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,012.72 : 19,515.84 = 5,217.28 : x
2. Step 2: Convert to fraction form
   13,012.72/19,515.84 = 5,217.28/x
3. Step 3: Cross multiply
   13,012.72x = 19,515.84 × 5,217.28
4. Step 4: Simplify right side
   13,012.72x = 101,819,601.72
5. Step 5: Solve for x
   x = 101,819,601.72/13,012.72
6. Step 6: Final answer
   x = 7,824.62