Finding the Fourth Proportional to 5,279.31, 7,285.34 and 2,889.27

Step by Step Solution

1. Step 1: Write the proportion equation
   5,279.31 : 7,285.34 = 2,889.27 : x
2. Step 2: Convert to fraction form
   5,279.31/7,285.34 = 2,889.27/x
3. Step 3: Cross multiply
   5,279.31x = 7,285.34 × 2,889.27
4. Step 4: Simplify right side
   5,279.31x = 21,049,321.52
5. Step 5: Solve for x
   x = 21,049,321.52/5,279.31
6. Step 6: Final answer
   x = 3,987.13