Finding the Fourth Proportional to 1,443.52, 2,159.90 and 858.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.52 : 2,159.90 = 858.84 : x
2. Step 2: Convert to fraction form
   1,443.52/2,159.90 = 858.84/x
3. Step 3: Cross multiply
   1,443.52x = 2,159.90 × 858.84
4. Step 4: Simplify right side
   1,443.52x = 1,854,999.34
5. Step 5: Solve for x
   x = 1,854,999.34/1,443.52
6. Step 6: Final answer
   x = 1,285.05