Finding the Fourth Proportional to 13,310.20, 19,961.89 and 3,948.03

Step by Step Solution

1. Step 1: Write the proportion equation
   13,310.20 : 19,961.89 = 3,948.03 : x
2. Step 2: Convert to fraction form
   13,310.20/19,961.89 = 3,948.03/x
3. Step 3: Cross multiply
   13,310.20x = 19,961.89 × 3,948.03
4. Step 4: Simplify right side
   13,310.20x = 78,810,140.58
5. Step 5: Solve for x
   x = 78,810,140.58/13,310.20
6. Step 6: Final answer
   x = 5,921.03