Finding the Fourth Proportional to 7,086.16, 10,620.60 and 3,185.20

Step by Step Solution

1. Step 1: Write the proportion equation
   7,086.16 : 10,620.60 = 3,185.20 : x
2. Step 2: Convert to fraction form
   7,086.16/10,620.60 = 3,185.20/x
3. Step 3: Cross multiply
   7,086.16x = 10,620.60 × 3,185.20
4. Step 4: Simplify right side
   7,086.16x = 33,828,735.12
5. Step 5: Solve for x
   x = 33,828,735.12/7,086.16
6. Step 6: Final answer
   x = 4,773.92