Finding the Fourth Proportional to 1,311.83, 1,810.34 and 722.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.83 : 1,810.34 = 722.37 : x
2. Step 2: Convert to fraction form
   1,311.83/1,810.34 = 722.37/x
3. Step 3: Cross multiply
   1,311.83x = 1,810.34 × 722.37
4. Step 4: Simplify right side
   1,311.83x = 1,307,735.31
5. Step 5: Solve for x
   x = 1,307,735.31/1,311.83
6. Step 6: Final answer
   x = 996.88