Finding the Fourth Proportional to 1,086.59, 1,500.05 and 850.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.59 : 1,500.05 = 850.12 : x
2. Step 2: Convert to fraction form
   1,086.59/1,500.05 = 850.12/x
3. Step 3: Cross multiply
   1,086.59x = 1,500.05 × 850.12
4. Step 4: Simplify right side
   1,086.59x = 1,275,222.51
5. Step 5: Solve for x
   x = 1,275,222.51/1,086.59
6. Step 6: Final answer
   x = 1,173.60