Finding the Fourth Proportional to 1,385.46, 1,912.20 and 854.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.46 : 1,912.20 = 854.52 : x
2. Step 2: Convert to fraction form
   1,385.46/1,912.20 = 854.52/x
3. Step 3: Cross multiply
   1,385.46x = 1,912.20 × 854.52
4. Step 4: Simplify right side
   1,385.46x = 1,634,013.14
5. Step 5: Solve for x
   x = 1,634,013.14/1,385.46
6. Step 6: Final answer
   x = 1,179.40