Finding the Fourth Proportional to 13,290.89, 19,932.68 and 3,928.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,290.89 : 19,932.68 = 3,928.10 : x
2. Step 2: Convert to fraction form
   13,290.89/19,932.68 = 3,928.10/x
3. Step 3: Cross multiply
   13,290.89x = 19,932.68 × 3,928.10
4. Step 4: Simplify right side
   13,290.89x = 78,297,470.46
5. Step 5: Solve for x
   x = 78,297,470.46/13,290.89
6. Step 6: Final answer
   x = 5,891.07