Finding the Fourth Proportional to 1,417.28, 1,956.79 and 1,085.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.28 : 1,956.79 = 1,085.11 : x
2. Step 2: Convert to fraction form
   1,417.28/1,956.79 = 1,085.11/x
3. Step 3: Cross multiply
   1,417.28x = 1,956.79 × 1,085.11
4. Step 4: Simplify right side
   1,417.28x = 2,123,328.86
5. Step 5: Solve for x
   x = 2,123,328.86/1,417.28
6. Step 6: Final answer
   x = 1,498.18