Finding the Fourth Proportional to 1,141.69, 1,575.77 and 721.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.69 : 1,575.77 = 721.77 : x
2. Step 2: Convert to fraction form
   1,141.69/1,575.77 = 721.77/x
3. Step 3: Cross multiply
   1,141.69x = 1,575.77 × 721.77
4. Step 4: Simplify right side
   1,141.69x = 1,137,339.90
5. Step 5: Solve for x
   x = 1,137,339.90/1,141.69
6. Step 6: Final answer
   x = 996.19