Finding the Fourth Proportional to 13,269.78, 19,901.82 and 3,907.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,269.78 : 19,901.82 = 3,907.20 : x
2. Step 2: Convert to fraction form
   13,269.78/19,901.82 = 3,907.20/x
3. Step 3: Cross multiply
   13,269.78x = 19,901.82 × 3,907.20
4. Step 4: Simplify right side
   13,269.78x = 77,760,391.10
5. Step 5: Solve for x
   x = 77,760,391.10/13,269.78
6. Step 6: Final answer
   x = 5,859.96