Finding the Fourth Proportional to 2,380.55, 3,285.09 and 1,386.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,380.55 : 3,285.09 = 1,386.17 : x
2. Step 2: Convert to fraction form
   2,380.55/3,285.09 = 1,386.17/x
3. Step 3: Cross multiply
   2,380.55x = 3,285.09 × 1,386.17
4. Step 4: Simplify right side
   2,380.55x = 4,553,676.78
5. Step 5: Solve for x
   x = 4,553,676.78/2,380.55
6. Step 6: Final answer
   x = 1,912.87