Finding the Fourth Proportional to 1,520.93, 2,098.88 and 857.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.93 : 2,098.88 = 857.78 : x
2. Step 2: Convert to fraction form
   1,520.93/2,098.88 = 857.78/x
3. Step 3: Cross multiply
   1,520.93x = 2,098.88 × 857.78
4. Step 4: Simplify right side
   1,520.93x = 1,800,373.59
5. Step 5: Solve for x
   x = 1,800,373.59/1,520.93
6. Step 6: Final answer
   x = 1,183.73