Finding the Fourth Proportional to 2,380.63, 3,285.47 and 1,386

Step by Step Solution

1. Step 1: Write the proportion equation
   2,380.63 : 3,285.47 = 1,386 : x
2. Step 2: Convert to fraction form
   2,380.63/3,285.47 = 1,386/x
3. Step 3: Cross multiply
   2,380.63x = 3,285.47 × 1,386
4. Step 4: Simplify right side
   2,380.63x = 4,553,664.89
5. Step 5: Solve for x
   x = 4,553,664.89/2,380.63
6. Step 6: Final answer
   x = 1,912.80