Finding the Fourth Proportional to 1,086.39, 1,499.46 and 772.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.39 : 1,499.46 = 772.11 : x
2. Step 2: Convert to fraction form
   1,086.39/1,499.46 = 772.11/x
3. Step 3: Cross multiply
   1,086.39x = 1,499.46 × 772.11
4. Step 4: Simplify right side
   1,086.39x = 1,157,748.06
5. Step 5: Solve for x
   x = 1,157,748.06/1,086.39
6. Step 6: Final answer
   x = 1,065.68