Finding the Fourth Proportional to 1,443.88, 1,992.20 and 854.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.88 : 1,992.20 = 854.30 : x
2. Step 2: Convert to fraction form
   1,443.88/1,992.20 = 854.30/x
3. Step 3: Cross multiply
   1,443.88x = 1,992.20 × 854.30
4. Step 4: Simplify right side
   1,443.88x = 1,701,925.96
5. Step 5: Solve for x
   x = 1,701,925.96/1,443.88
6. Step 6: Final answer
   x = 1,178.72