Finding the Fourth Proportional to 1,072.48, 1,476.72 and 850.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.48 : 1,476.72 = 850.72 : x
2. Step 2: Convert to fraction form
   1,072.48/1,476.72 = 850.72/x
3. Step 3: Cross multiply
   1,072.48x = 1,476.72 × 850.72
4. Step 4: Simplify right side
   1,072.48x = 1,256,275.24
5. Step 5: Solve for x
   x = 1,256,275.24/1,072.48
6. Step 6: Final answer
   x = 1,171.37