Finding the Fourth Proportional to 1,080.16, 1,618.38 and 850.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.16 : 1,618.38 = 850.52 : x
2. Step 2: Convert to fraction form
   1,080.16/1,618.38 = 850.52/x
3. Step 3: Cross multiply
   1,080.16x = 1,618.38 × 850.52
4. Step 4: Simplify right side
   1,080.16x = 1,376,464.56
5. Step 5: Solve for x
   x = 1,376,464.56/1,080.16
6. Step 6: Final answer
   x = 1,274.32