Finding the Fourth Proportional to 13,241.28, 19,861.89 and 3,380.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,241.28 : 19,861.89 = 3,380.55 : x
2. Step 2: Convert to fraction form
   13,241.28/19,861.89 = 3,380.55/x
3. Step 3: Cross multiply
   13,241.28x = 19,861.89 × 3,380.55
4. Step 4: Simplify right side
   13,241.28x = 67,144,112.24
5. Step 5: Solve for x
   x = 67,144,112.24/13,241.28
6. Step 6: Final answer
   x = 5,070.82