Finding the Fourth Proportional to 1,408.96, 2,111.84 and 859.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.96 : 2,111.84 = 859.94 : x
2. Step 2: Convert to fraction form
   1,408.96/2,111.84 = 859.94/x
3. Step 3: Cross multiply
   1,408.96x = 2,111.84 × 859.94
4. Step 4: Simplify right side
   1,408.96x = 1,816,055.69
5. Step 5: Solve for x
   x = 1,816,055.69/1,408.96
6. Step 6: Final answer
   x = 1,288.93