Finding the Fourth Proportional to 2,591.86, 3,887.98 and 2,287.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.86 : 3,887.98 = 2,287.30 : x
2. Step 2: Convert to fraction form
   2,591.86/3,887.98 = 2,287.30/x
3. Step 3: Cross multiply
   2,591.86x = 3,887.98 × 2,287.30
4. Step 4: Simplify right side
   2,591.86x = 8,892,976.65
5. Step 5: Solve for x
   x = 8,892,976.65/2,591.86
6. Step 6: Final answer
   x = 3,431.12