Finding the Fourth Proportional to 5,209.28, 7,188.89 and 2,851.55

Step by Step Solution

1. Step 1: Write the proportion equation
   5,209.28 : 7,188.89 = 2,851.55 : x
2. Step 2: Convert to fraction form
   5,209.28/7,188.89 = 2,851.55/x
3. Step 3: Cross multiply
   5,209.28x = 7,188.89 × 2,851.55
4. Step 4: Simplify right side
   5,209.28x = 20,499,429.08
5. Step 5: Solve for x
   x = 20,499,429.08/5,209.28
6. Step 6: Final answer
   x = 3,935.18