Finding the Fourth Proportional to 1,111.72, 1,659.63 and 965.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.72 : 1,659.63 = 965.96 : x
2. Step 2: Convert to fraction form
   1,111.72/1,659.63 = 965.96/x
3. Step 3: Cross multiply
   1,111.72x = 1,659.63 × 965.96
4. Step 4: Simplify right side
   1,111.72x = 1,603,136.19
5. Step 5: Solve for x
   x = 1,603,136.19/1,111.72
6. Step 6: Final answer
   x = 1,442.03