Finding the Fourth Proportional to 5,167.71, 7,131.42 and 2,809.89

Step by Step Solution

1. Step 1: Write the proportion equation
   5,167.71 : 7,131.42 = 2,809.89 : x
2. Step 2: Convert to fraction form
   5,167.71/7,131.42 = 2,809.89/x
3. Step 3: Cross multiply
   5,167.71x = 7,131.42 × 2,809.89
4. Step 4: Simplify right side
   5,167.71x = 20,038,505.74
5. Step 5: Solve for x
   x = 20,038,505.74/5,167.71
6. Step 6: Final answer
   x = 3,877.64