Finding the Fourth Proportional to 2,380.19, 3,285.16 and 1,385.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,380.19 : 3,285.16 = 1,385.30 : x
2. Step 2: Convert to fraction form
   2,380.19/3,285.16 = 1,385.30/x
3. Step 3: Cross multiply
   2,380.19x = 3,285.16 × 1,385.30
4. Step 4: Simplify right side
   2,380.19x = 4,550,936.90
5. Step 5: Solve for x
   x = 4,550,936.90/2,380.19
6. Step 6: Final answer
   x = 1,912.01