Finding the Fourth Proportional to 1,145.99, 1,719.61 and 496.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.99 : 1,719.61 = 496.78 : x
2. Step 2: Convert to fraction form
   1,145.99/1,719.61 = 496.78/x
3. Step 3: Cross multiply
   1,145.99x = 1,719.61 × 496.78
4. Step 4: Simplify right side
   1,145.99x = 854,262.31
5. Step 5: Solve for x
   x = 854,262.31/1,145.99
6. Step 6: Final answer
   x = 745.43