Finding the Fourth Proportional to 1,191.48, 1,644.42 and 719.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.48 : 1,644.42 = 719.72 : x
2. Step 2: Convert to fraction form
   1,191.48/1,644.42 = 719.72/x
3. Step 3: Cross multiply
   1,191.48x = 1,644.42 × 719.72
4. Step 4: Simplify right side
   1,191.48x = 1,183,521.96
5. Step 5: Solve for x
   x = 1,183,521.96/1,191.48
6. Step 6: Final answer
   x = 993.32