Finding the Fourth Proportional to 1,906.78, 2,857.89 and 982.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,906.78 : 2,857.89 = 982.78 : x
2. Step 2: Convert to fraction form
   1,906.78/2,857.89 = 982.78/x
3. Step 3: Cross multiply
   1,906.78x = 2,857.89 × 982.78
4. Step 4: Simplify right side
   1,906.78x = 2,808,677.13
5. Step 5: Solve for x
   x = 2,808,677.13/1,906.78
6. Step 6: Final answer
   x = 1,472.99