Finding the Fourth Proportional to 1,403.42, 2,108.17 and 855.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.42 : 2,108.17 = 855.93 : x
2. Step 2: Convert to fraction form
   1,403.42/2,108.17 = 855.93/x
3. Step 3: Cross multiply
   1,403.42x = 2,108.17 × 855.93
4. Step 4: Simplify right side
   1,403.42x = 1,804,445.95
5. Step 5: Solve for x
   x = 1,804,445.95/1,403.42
6. Step 6: Final answer
   x = 1,285.75