Finding the Fourth Proportional to 1,311.83, 1,810.28 and 722.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.83 : 1,810.28 = 722.36 : x
2. Step 2: Convert to fraction form
   1,311.83/1,810.28 = 722.36/x
3. Step 3: Cross multiply
   1,311.83x = 1,810.28 × 722.36
4. Step 4: Simplify right side
   1,311.83x = 1,307,661.20
5. Step 5: Solve for x
   x = 1,307,661.20/1,311.83
6. Step 6: Final answer
   x = 996.83