Finding the Fourth Proportional to 13,147.12, 19,718.52 and 4,380.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,147.12 : 19,718.52 = 4,380.88 : x
2. Step 2: Convert to fraction form
   13,147.12/19,718.52 = 4,380.88/x
3. Step 3: Cross multiply
   13,147.12x = 19,718.52 × 4,380.88
4. Step 4: Simplify right side
   13,147.12x = 86,384,469.90
5. Step 5: Solve for x
   x = 86,384,469.90/13,147.12
6. Step 6: Final answer
   x = 6,570.60