Finding the Fourth Proportional to 13,145.72, 19,722.02 and 3,911.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,145.72 : 19,722.02 = 3,911.48 : x
2. Step 2: Convert to fraction form
   13,145.72/19,722.02 = 3,911.48/x
3. Step 3: Cross multiply
   13,145.72x = 19,722.02 × 3,911.48
4. Step 4: Simplify right side
   13,145.72x = 77,142,286.79
5. Step 5: Solve for x
   x = 77,142,286.79/13,145.72
6. Step 6: Final answer
   x = 5,868.24