Finding the Fourth Proportional to 13,605.57, 20,407.39 and 3,610.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,605.57 : 20,407.39 = 3,610.09 : x
2. Step 2: Convert to fraction form
   13,605.57/20,407.39 = 3,610.09/x
3. Step 3: Cross multiply
   13,605.57x = 20,407.39 × 3,610.09
4. Step 4: Simplify right side
   13,605.57x = 73,672,514.57
5. Step 5: Solve for x
   x = 73,672,514.57/13,605.57
6. Step 6: Final answer
   x = 5,414.88