Finding the Fourth Proportional to 5,209.79, 7,189.31 and 2,851.94

Step by Step Solution

1. Step 1: Write the proportion equation
   5,209.79 : 7,189.31 = 2,851.94 : x
2. Step 2: Convert to fraction form
   5,209.79/7,189.31 = 2,851.94/x
3. Step 3: Cross multiply
   5,209.79x = 7,189.31 × 2,851.94
4. Step 4: Simplify right side
   5,209.79x = 20,503,505.86
5. Step 5: Solve for x
   x = 20,503,505.86/5,209.79
6. Step 6: Final answer
   x = 3,935.58