Finding the Fourth Proportional to 2,091.80, 2,887.18 and 1,383.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.80 : 2,887.18 = 1,383.78 : x
2. Step 2: Convert to fraction form
   2,091.80/2,887.18 = 1,383.78/x
3. Step 3: Cross multiply
   2,091.80x = 2,887.18 × 1,383.78
4. Step 4: Simplify right side
   2,091.80x = 3,995,221.94
5. Step 5: Solve for x
   x = 3,995,221.94/2,091.80
6. Step 6: Final answer
   x = 1,909.94