Finding the Fourth Proportional to 8,721.23, 13,081.72 and 2,147.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,721.23 : 13,081.72 = 2,147.47 : x
2. Step 2: Convert to fraction form
   8,721.23/13,081.72 = 2,147.47/x
3. Step 3: Cross multiply
   8,721.23x = 13,081.72 × 2,147.47
4. Step 4: Simplify right side
   8,721.23x = 28,092,601.25
5. Step 5: Solve for x
   x = 28,092,601.25/8,721.23
6. Step 6: Final answer
   x = 3,221.17