Finding the Fourth Proportional to 1,086.72, 1,497.60 and 775.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.72 : 1,497.60 = 775.68 : x
2. Step 2: Convert to fraction form
   1,086.72/1,497.60 = 775.68/x
3. Step 3: Cross multiply
   1,086.72x = 1,497.60 × 775.68
4. Step 4: Simplify right side
   1,086.72x = 1,161,658.37
5. Step 5: Solve for x
   x = 1,161,658.37/1,086.72
6. Step 6: Final answer
   x = 1,068.96