Finding the Fourth Proportional to 13,304.28, 19,958.58 and 3,945.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,304.28 : 19,958.58 = 3,945.21 : x
2. Step 2: Convert to fraction form
   13,304.28/19,958.58 = 3,945.21/x
3. Step 3: Cross multiply
   13,304.28x = 19,958.58 × 3,945.21
4. Step 4: Simplify right side
   13,304.28x = 78,740,789.40
5. Step 5: Solve for x
   x = 78,740,789.40/13,304.28
6. Step 6: Final answer
   x = 5,918.46