Finding the Fourth Proportional to 1,856.15, 2,781.83 and 759.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,856.15 : 2,781.83 = 759.21 : x
2. Step 2: Convert to fraction form
   1,856.15/2,781.83 = 759.21/x
3. Step 3: Cross multiply
   1,856.15x = 2,781.83 × 759.21
4. Step 4: Simplify right side
   1,856.15x = 2,111,993.15
5. Step 5: Solve for x
   x = 2,111,993.15/1,856.15
6. Step 6: Final answer
   x = 1,137.84