Finding the Fourth Proportional to 805.34, 1,200.50 and 773.78

Step by Step Solution

1. Step 1: Write the proportion equation
   805.34 : 1,200.50 = 773.78 : x
2. Step 2: Convert to fraction form
   805.34/1,200.50 = 773.78/x
3. Step 3: Cross multiply
   805.34x = 1,200.50 × 773.78
4. Step 4: Simplify right side
   805.34x = 928,922.89
5. Step 5: Solve for x
   x = 928,922.89/805.34
6. Step 6: Final answer
   x = 1,153.45