Finding the Fourth Proportional to 928.10, 1,279.69 and 770.91

Step by Step Solution

1. Step 1: Write the proportion equation
   928.10 : 1,279.69 = 770.91 : x
2. Step 2: Convert to fraction form
   928.10/1,279.69 = 770.91/x
3. Step 3: Cross multiply
   928.10x = 1,279.69 × 770.91
4. Step 4: Simplify right side
   928.10x = 986,523.89
5. Step 5: Solve for x
   x = 986,523.89/928.10
6. Step 6: Final answer
   x = 1,062.96