Finding the Fourth Proportional to 1,385.47, 1,912.31 and 965.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.47 : 1,912.31 = 965.89 : x
2. Step 2: Convert to fraction form
   1,385.47/1,912.31 = 965.89/x
3. Step 3: Cross multiply
   1,385.47x = 1,912.31 × 965.89
4. Step 4: Simplify right side
   1,385.47x = 1,847,081.11
5. Step 5: Solve for x
   x = 1,847,081.11/1,385.47
6. Step 6: Final answer
   x = 1,333.18