Finding the Fourth Proportional to 1,854.78, 2,783.31 and 759.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,854.78 : 2,783.31 = 759.15 : x
2. Step 2: Convert to fraction form
   1,854.78/2,783.31 = 759.15/x
3. Step 3: Cross multiply
   1,854.78x = 2,783.31 × 759.15
4. Step 4: Simplify right side
   1,854.78x = 2,112,949.79
5. Step 5: Solve for x
   x = 2,112,949.79/1,854.78
6. Step 6: Final answer
   x = 1,139.19