Finding the Fourth Proportional to 911.17, 1,363.71 and 801.42

Step by Step Solution

1. Step 1: Write the proportion equation
   911.17 : 1,363.71 = 801.42 : x
2. Step 2: Convert to fraction form
   911.17/1,363.71 = 801.42/x
3. Step 3: Cross multiply
   911.17x = 1,363.71 × 801.42
4. Step 4: Simplify right side
   911.17x = 1,092,904.47
5. Step 5: Solve for x
   x = 1,092,904.47/911.17
6. Step 6: Final answer
   x = 1,199.45