Finding the Fourth Proportional to 2,330.76, 3,216.04 and 1,399.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,330.76 : 3,216.04 = 1,399.28 : x
2. Step 2: Convert to fraction form
   2,330.76/3,216.04 = 1,399.28/x
3. Step 3: Cross multiply
   2,330.76x = 3,216.04 × 1,399.28
4. Step 4: Simplify right side
   2,330.76x = 4,500,140.45
5. Step 5: Solve for x
   x = 4,500,140.45/2,330.76
6. Step 6: Final answer
   x = 1,930.76