Finding the Fourth Proportional to 1,311.88, 1,810.41 and 722.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.88 : 1,810.41 = 722.42 : x
2. Step 2: Convert to fraction form
   1,311.88/1,810.41 = 722.42/x
3. Step 3: Cross multiply
   1,311.88x = 1,810.41 × 722.42
4. Step 4: Simplify right side
   1,311.88x = 1,307,876.39
5. Step 5: Solve for x
   x = 1,307,876.39/1,311.88
6. Step 6: Final answer
   x = 996.95