Finding the Fourth Proportional to 1,161.72, 1,603.46 and 719.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,161.72 : 1,603.46 = 719.37 : x
2. Step 2: Convert to fraction form
   1,161.72/1,603.46 = 719.37/x
3. Step 3: Cross multiply
   1,161.72x = 1,603.46 × 719.37
4. Step 4: Simplify right side
   1,161.72x = 1,153,482.82
5. Step 5: Solve for x
   x = 1,153,482.82/1,161.72
6. Step 6: Final answer
   x = 992.91