Finding the Fourth Proportional to 12,719.31, 19,078.63 and 5,697.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,719.31 : 19,078.63 = 5,697.42 : x
2. Step 2: Convert to fraction form
   12,719.31/19,078.63 = 5,697.42/x
3. Step 3: Cross multiply
   12,719.31x = 19,078.63 × 5,697.42
4. Step 4: Simplify right side
   12,719.31x = 108,698,968.13
5. Step 5: Solve for x
   x = 108,698,968.13/12,719.31
6. Step 6: Final answer
   x = 8,545.98