Finding the Fourth Proportional to 8,719.22, 13,078.72 and 2,145.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,719.22 : 13,078.72 = 2,145.47 : x
2. Step 2: Convert to fraction form
   8,719.22/13,078.72 = 2,145.47/x
3. Step 3: Cross multiply
   8,719.22x = 13,078.72 × 2,145.47
4. Step 4: Simplify right side
   8,719.22x = 28,059,938.69
5. Step 5: Solve for x
   x = 28,059,938.69/8,719.22
6. Step 6: Final answer
   x = 3,218.17