Finding the Fourth Proportional to 1,385.73, 1,908.41 and 1,355.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.73 : 1,908.41 = 1,355.49 : x
2. Step 2: Convert to fraction form
   1,385.73/1,908.41 = 1,355.49/x
3. Step 3: Cross multiply
   1,385.73x = 1,908.41 × 1,355.49
4. Step 4: Simplify right side
   1,385.73x = 2,586,830.67
5. Step 5: Solve for x
   x = 2,586,830.67/1,385.73
6. Step 6: Final answer
   x = 1,866.76