Finding the Fourth Proportional to 19,145.46, 28,719.55 and 5,105.41

Step by Step Solution

1. Step 1: Write the proportion equation
   19,145.46 : 28,719.55 = 5,105.41 : x
2. Step 2: Convert to fraction form
   19,145.46/28,719.55 = 5,105.41/x
3. Step 3: Cross multiply
   19,145.46x = 28,719.55 × 5,105.41
4. Step 4: Simplify right side
   19,145.46x = 146,625,066.20
5. Step 5: Solve for x
   x = 146,625,066.20/19,145.46
6. Step 6: Final answer
   x = 7,658.48