Finding the Fourth Proportional to 1,311.83, 1,810.35 and 722.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.83 : 1,810.35 = 722.38 : x
2. Step 2: Convert to fraction form
   1,311.83/1,810.35 = 722.38/x
3. Step 3: Cross multiply
   1,311.83x = 1,810.35 × 722.38
4. Step 4: Simplify right side
   1,311.83x = 1,307,760.63
5. Step 5: Solve for x
   x = 1,307,760.63/1,311.83
6. Step 6: Final answer
   x = 996.90