Finding the Fourth Proportional to 911.55, 1,366.52 and 773.61

Step by Step Solution

1. Step 1: Write the proportion equation
   911.55 : 1,366.52 = 773.61 : x
2. Step 2: Convert to fraction form
   911.55/1,366.52 = 773.61/x
3. Step 3: Cross multiply
   911.55x = 1,366.52 × 773.61
4. Step 4: Simplify right side
   911.55x = 1,057,144.54
5. Step 5: Solve for x
   x = 1,057,144.54/911.55
6. Step 6: Final answer
   x = 1,159.72