Finding the Fourth Proportional to 2,359.81, 3,256.55 and 1,311.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,359.81 : 3,256.55 = 1,311.88 : x
2. Step 2: Convert to fraction form
   2,359.81/3,256.55 = 1,311.88/x
3. Step 3: Cross multiply
   2,359.81x = 3,256.55 × 1,311.88
4. Step 4: Simplify right side
   2,359.81x = 4,272,179.97
5. Step 5: Solve for x
   x = 4,272,179.97/2,359.81
6. Step 6: Final answer
   x = 1,810.39