Finding the Fourth Proportional to 1,906.80, 2,854.72 and 1,083.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,906.80 : 2,854.72 = 1,083.12 : x
2. Step 2: Convert to fraction form
   1,906.80/2,854.72 = 1,083.12/x
3. Step 3: Cross multiply
   1,906.80x = 2,854.72 × 1,083.12
4. Step 4: Simplify right side
   1,906.80x = 3,092,004.33
5. Step 5: Solve for x
   x = 3,092,004.33/1,906.80
6. Step 6: Final answer
   x = 1,621.57