Finding the Fourth Proportional to 13,146.09, 19,718.72 and 4,380.77

Step by Step Solution

1. Step 1: Write the proportion equation
   13,146.09 : 19,718.72 = 4,380.77 : x
2. Step 2: Convert to fraction form
   13,146.09/19,718.72 = 4,380.77/x
3. Step 3: Cross multiply
   13,146.09x = 19,718.72 × 4,380.77
4. Step 4: Simplify right side
   13,146.09x = 86,383,177.01
5. Step 5: Solve for x
   x = 86,383,177.01/13,146.09
6. Step 6: Final answer
   x = 6,571.02