Finding the Fourth Proportional to 1,311.82, 1,810.43 and 722.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.82 : 1,810.43 = 722.47 : x
2. Step 2: Convert to fraction form
   1,311.82/1,810.43 = 722.47/x
3. Step 3: Cross multiply
   1,311.82x = 1,810.43 × 722.47
4. Step 4: Simplify right side
   1,311.82x = 1,307,977.30
5. Step 5: Solve for x
   x = 1,307,977.30/1,311.82
6. Step 6: Final answer
   x = 997.07