Finding the Fourth Proportional to 1,434.15, 2,147.94 and 855.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.15 : 2,147.94 = 855.81 : x
2. Step 2: Convert to fraction form
   1,434.15/2,147.94 = 855.81/x
3. Step 3: Cross multiply
   1,434.15x = 2,147.94 × 855.81
4. Step 4: Simplify right side
   1,434.15x = 1,838,228.53
5. Step 5: Solve for x
   x = 1,838,228.53/1,434.15
6. Step 6: Final answer
   x = 1,281.75