Finding the Fourth Proportional to 1,441.09, 2,161.89 and 856.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.09 : 2,161.89 = 856.58 : x
2. Step 2: Convert to fraction form
   1,441.09/2,161.89 = 856.58/x
3. Step 3: Cross multiply
   1,441.09x = 2,161.89 × 856.58
4. Step 4: Simplify right side
   1,441.09x = 1,851,820.93
5. Step 5: Solve for x
   x = 1,851,820.93/1,441.09
6. Step 6: Final answer
   x = 1,285.01