Finding the Fourth Proportional to 1,172.43, 1,617.25 and 774.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.43 : 1,617.25 = 774.10 : x
2. Step 2: Convert to fraction form
   1,172.43/1,617.25 = 774.10/x
3. Step 3: Cross multiply
   1,172.43x = 1,617.25 × 774.10
4. Step 4: Simplify right side
   1,172.43x = 1,251,901.27
5. Step 5: Solve for x
   x = 1,251,901.27/1,172.43
6. Step 6: Final answer
   x = 1,067.78