Finding the Fourth Proportional to 2,336.85, 3,224.81 and 1,288.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,336.85 : 3,224.81 = 1,288.91 : x
2. Step 2: Convert to fraction form
   2,336.85/3,224.81 = 1,288.91/x
3. Step 3: Cross multiply
   2,336.85x = 3,224.81 × 1,288.91
4. Step 4: Simplify right side
   2,336.85x = 4,156,501.14
5. Step 5: Solve for x
   x = 4,156,501.14/2,336.85
6. Step 6: Final answer
   x = 1,778.68