Finding the Fourth Proportional to 2,333.20, 3,219.78 and 1,285.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,333.20 : 3,219.78 = 1,285.30 : x
2. Step 2: Convert to fraction form
   2,333.20/3,219.78 = 1,285.30/x
3. Step 3: Cross multiply
   2,333.20x = 3,219.78 × 1,285.30
4. Step 4: Simplify right side
   2,333.20x = 4,138,383.23
5. Step 5: Solve for x
   x = 4,138,383.23/2,333.20
6. Step 6: Final answer
   x = 1,773.69