Finding the Fourth Proportional to 1,311.83, 1,810.35 and 722.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.83 : 1,810.35 = 722.39 : x
2. Step 2: Convert to fraction form
   1,311.83/1,810.35 = 722.39/x
3. Step 3: Cross multiply
   1,311.83x = 1,810.35 × 722.39
4. Step 4: Simplify right side
   1,311.83x = 1,307,769.68
5. Step 5: Solve for x
   x = 1,307,769.68/1,311.83
6. Step 6: Final answer
   x = 996.91