Finding the Fourth Proportional to 13,240.89, 19,861.20 and 3,380.06

Step by Step Solution

1. Step 1: Write the proportion equation
   13,240.89 : 19,861.20 = 3,380.06 : x
2. Step 2: Convert to fraction form
   13,240.89/19,861.20 = 3,380.06/x
3. Step 3: Cross multiply
   13,240.89x = 19,861.20 × 3,380.06
4. Step 4: Simplify right side
   13,240.89x = 67,132,097.33
5. Step 5: Solve for x
   x = 67,132,097.33/13,240.89
6. Step 6: Final answer
   x = 5,070.06