Finding the Fourth Proportional to 2,380.17, 3,285.48 and 1,385.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,380.17 : 3,285.48 = 1,385.76 : x
2. Step 2: Convert to fraction form
   2,380.17/3,285.48 = 1,385.76/x
3. Step 3: Cross multiply
   2,380.17x = 3,285.48 × 1,385.76
4. Step 4: Simplify right side
   2,380.17x = 4,552,886.76
5. Step 5: Solve for x
   x = 4,552,886.76/2,380.17
6. Step 6: Final answer
   x = 1,912.84