Finding the Fourth Proportional to 807.72, 1,114.52 and 766.72

Step by Step Solution

1. Step 1: Write the proportion equation
   807.72 : 1,114.52 = 766.72 : x
2. Step 2: Convert to fraction form
   807.72/1,114.52 = 766.72/x
3. Step 3: Cross multiply
   807.72x = 1,114.52 × 766.72
4. Step 4: Simplify right side
   807.72x = 854,524.77
5. Step 5: Solve for x
   x = 854,524.77/807.72
6. Step 6: Final answer
   x = 1,057.95