Finding the Fourth Proportional to 5,167.72, 7,131.46 and 2,809.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,167.72 : 7,131.46 = 2,809.86 : x
2. Step 2: Convert to fraction form
   5,167.72/7,131.46 = 2,809.86/x
3. Step 3: Cross multiply
   5,167.72x = 7,131.46 × 2,809.86
4. Step 4: Simplify right side
   5,167.72x = 20,038,404.20
5. Step 5: Solve for x
   x = 20,038,404.20/5,167.72
6. Step 6: Final answer
   x = 3,877.61