Finding the Fourth Proportional to 1,404.77, 2,105.56 and 855.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.77 : 2,105.56 = 855.74 : x
2. Step 2: Convert to fraction form
   1,404.77/2,105.56 = 855.74/x
3. Step 3: Cross multiply
   1,404.77x = 2,105.56 × 855.74
4. Step 4: Simplify right side
   1,404.77x = 1,801,818.25
5. Step 5: Solve for x
   x = 1,801,818.25/1,404.77
6. Step 6: Final answer
   x = 1,282.65