Finding the Fourth Proportional to 13,585.39, 20,379.30 and 3,724.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,585.39 : 20,379.30 = 3,724.72 : x
2. Step 2: Convert to fraction form
   13,585.39/20,379.30 = 3,724.72/x
3. Step 3: Cross multiply
   13,585.39x = 20,379.30 × 3,724.72
4. Step 4: Simplify right side
   13,585.39x = 75,907,186.30
5. Step 5: Solve for x
   x = 75,907,186.30/13,585.39
6. Step 6: Final answer
   x = 5,587.41