Finding the Fourth Proportional to 917.94, 1,269.72 and 770.34

Step by Step Solution

1. Step 1: Write the proportion equation
   917.94 : 1,269.72 = 770.34 : x
2. Step 2: Convert to fraction form
   917.94/1,269.72 = 770.34/x
3. Step 3: Cross multiply
   917.94x = 1,269.72 × 770.34
4. Step 4: Simplify right side
   917.94x = 978,116.10
5. Step 5: Solve for x
   x = 978,116.10/917.94
6. Step 6: Final answer
   x = 1,065.56