Finding the Fourth Proportional to 2,380.52, 3,285.12 and 1,386.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,380.52 : 3,285.12 = 1,386.40 : x
2. Step 2: Convert to fraction form
   2,380.52/3,285.12 = 1,386.40/x
3. Step 3: Cross multiply
   2,380.52x = 3,285.12 × 1,386.40
4. Step 4: Simplify right side
   2,380.52x = 4,554,490.37
5. Step 5: Solve for x
   x = 4,554,490.37/2,380.52
6. Step 6: Final answer
   x = 1,913.23