Finding the Fourth Proportional to 13,150.72, 19,718.78 and 4,380.85

Step by Step Solution

1. Step 1: Write the proportion equation
   13,150.72 : 19,718.78 = 4,380.85 : x
2. Step 2: Convert to fraction form
   13,150.72/19,718.78 = 4,380.85/x
3. Step 3: Cross multiply
   13,150.72x = 19,718.78 × 4,380.85
4. Step 4: Simplify right side
   13,150.72x = 86,384,896.86
5. Step 5: Solve for x
   x = 86,384,896.86/13,150.72
6. Step 6: Final answer
   x = 6,568.84