Finding the Fourth Proportional to 1,071.72, 1,613.82 and 936.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.72 : 1,613.82 = 936.36 : x
2. Step 2: Convert to fraction form
   1,071.72/1,613.82 = 936.36/x
3. Step 3: Cross multiply
   1,071.72x = 1,613.82 × 936.36
4. Step 4: Simplify right side
   1,071.72x = 1,511,116.50
5. Step 5: Solve for x
   x = 1,511,116.50/1,071.72
6. Step 6: Final answer
   x = 1,409.99