Finding the Fourth Proportional to 5,280.31, 7,286.72 and 2,890.27

Step by Step Solution

1. Step 1: Write the proportion equation
   5,280.31 : 7,286.72 = 2,890.27 : x
2. Step 2: Convert to fraction form
   5,280.31/7,286.72 = 2,890.27/x
3. Step 3: Cross multiply
   5,280.31x = 7,286.72 × 2,890.27
4. Step 4: Simplify right side
   5,280.31x = 21,060,588.21
5. Step 5: Solve for x
   x = 21,060,588.21/5,280.31
6. Step 6: Final answer
   x = 3,988.51