Finding the Fourth Proportional to 1,091.34, 1,634.85 and 908.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.34 : 1,634.85 = 908.15 : x
2. Step 2: Convert to fraction form
   1,091.34/1,634.85 = 908.15/x
3. Step 3: Cross multiply
   1,091.34x = 1,634.85 × 908.15
4. Step 4: Simplify right side
   1,091.34x = 1,484,680.85
5. Step 5: Solve for x
   x = 1,484,680.85/1,091.34
6. Step 6: Final answer
   x = 1,360.42