Finding the Fourth Proportional to 1,191.69, 1,642.18 and 912.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.69 : 1,642.18 = 912.24 : x
2. Step 2: Convert to fraction form
   1,191.69/1,642.18 = 912.24/x
3. Step 3: Cross multiply
   1,191.69x = 1,642.18 × 912.24
4. Step 4: Simplify right side
   1,191.69x = 1,498,062.28
5. Step 5: Solve for x
   x = 1,498,062.28/1,191.69
6. Step 6: Final answer
   x = 1,257.09