Finding the Fourth Proportional to 13,147.50, 19,721.29 and 3,286.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,147.50 : 19,721.29 = 3,286.79 : x
2. Step 2: Convert to fraction form
   13,147.50/19,721.29 = 3,286.79/x
3. Step 3: Cross multiply
   13,147.50x = 19,721.29 × 3,286.79
4. Step 4: Simplify right side
   13,147.50x = 64,819,640.15
5. Step 5: Solve for x
   x = 64,819,640.15/13,147.50
6. Step 6: Final answer
   x = 4,930.19