Finding the Fourth Proportional to 1,145.43, 1,717.43 and 779.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.43 : 1,717.43 = 779.10 : x
2. Step 2: Convert to fraction form
   1,145.43/1,717.43 = 779.10/x
3. Step 3: Cross multiply
   1,145.43x = 1,717.43 × 779.10
4. Step 4: Simplify right side
   1,145.43x = 1,338,045.82
5. Step 5: Solve for x
   x = 1,338,045.82/1,145.43
6. Step 6: Final answer
   x = 1,168.16