Finding the Fourth Proportional to 2,380.86, 3,285.43 and 1,318.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,380.86 : 3,285.43 = 1,318.55 : x
2. Step 2: Convert to fraction form
   2,380.86/3,285.43 = 1,318.55/x
3. Step 3: Cross multiply
   2,380.86x = 3,285.43 × 1,318.55
4. Step 4: Simplify right side
   2,380.86x = 4,332,008.64
5. Step 5: Solve for x
   x = 4,332,008.64/2,380.86
6. Step 6: Final answer
   x = 1,819.51