Finding the Fourth Proportional to 13,020.39, 19,531.60 and 3,661.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,020.39 : 19,531.60 = 3,661.18 : x
2. Step 2: Convert to fraction form
   13,020.39/19,531.60 = 3,661.18/x
3. Step 3: Cross multiply
   13,020.39x = 19,531.60 × 3,661.18
4. Step 4: Simplify right side
   13,020.39x = 71,508,645.31
5. Step 5: Solve for x
   x = 71,508,645.31/13,020.39
6. Step 6: Final answer
   x = 5,492.05