Finding the Fourth Proportional to 5,209.61, 7,189.43 and 2,851.76

Step by Step Solution

1. Step 1: Write the proportion equation
   5,209.61 : 7,189.43 = 2,851.76 : x
2. Step 2: Convert to fraction form
   5,209.61/7,189.43 = 2,851.76/x
3. Step 3: Cross multiply
   5,209.61x = 7,189.43 × 2,851.76
4. Step 4: Simplify right side
   5,209.61x = 20,502,478.69
5. Step 5: Solve for x
   x = 20,502,478.69/5,209.61
6. Step 6: Final answer
   x = 3,935.52