Finding the Fourth Proportional to 7,081.72, 10,613.28 and 3,961.60

Step by Step Solution

1. Step 1: Write the proportion equation
   7,081.72 : 10,613.28 = 3,961.60 : x
2. Step 2: Convert to fraction form
   7,081.72/10,613.28 = 3,961.60/x
3. Step 3: Cross multiply
   7,081.72x = 10,613.28 × 3,961.60
4. Step 4: Simplify right side
   7,081.72x = 42,045,570.05
5. Step 5: Solve for x
   x = 42,045,570.05/7,081.72
6. Step 6: Final answer
   x = 5,937.20