Finding the Fourth Proportional to 1,198.91, 1,784.25 and 1,155.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,198.91 : 1,784.25 = 1,155.17 : x
2. Step 2: Convert to fraction form
   1,198.91/1,784.25 = 1,155.17/x
3. Step 3: Cross multiply
   1,198.91x = 1,784.25 × 1,155.17
4. Step 4: Simplify right side
   1,198.91x = 2,061,116.53
5. Step 5: Solve for x
   x = 2,061,116.53/1,198.91
6. Step 6: Final answer
   x = 1,719.16