Finding the Fourth Proportional to 789.08, 1,089.06 and 770.72

Step by Step Solution

1. Step 1: Write the proportion equation
   789.08 : 1,089.06 = 770.72 : x
2. Step 2: Convert to fraction form
   789.08/1,089.06 = 770.72/x
3. Step 3: Cross multiply
   789.08x = 1,089.06 × 770.72
4. Step 4: Simplify right side
   789.08x = 839,360.32
5. Step 5: Solve for x
   x = 839,360.32/789.08
6. Step 6: Final answer
   x = 1,063.72