Finding the Fourth Proportional to 911.96, 1,363.50 and 776.60

Step by Step Solution

1. Step 1: Write the proportion equation
   911.96 : 1,363.50 = 776.60 : x
2. Step 2: Convert to fraction form
   911.96/1,363.50 = 776.60/x
3. Step 3: Cross multiply
   911.96x = 1,363.50 × 776.60
4. Step 4: Simplify right side
   911.96x = 1,058,894.10
5. Step 5: Solve for x
   x = 1,058,894.10/911.96
6. Step 6: Final answer
   x = 1,161.12