Finding the Fourth Proportional to 1,131.39, 1,699.83 and 721.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.39 : 1,699.83 = 721.33 : x
2. Step 2: Convert to fraction form
   1,131.39/1,699.83 = 721.33/x
3. Step 3: Cross multiply
   1,131.39x = 1,699.83 × 721.33
4. Step 4: Simplify right side
   1,131.39x = 1,226,138.37
5. Step 5: Solve for x
   x = 1,226,138.37/1,131.39
6. Step 6: Final answer
   x = 1,083.75