Finding the Fourth Proportional to 1,071.72, 1,477.60 and 850.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.72 : 1,477.60 = 850.29 : x
2. Step 2: Convert to fraction form
   1,071.72/1,477.60 = 850.29/x
3. Step 3: Cross multiply
   1,071.72x = 1,477.60 × 850.29
4. Step 4: Simplify right side
   1,071.72x = 1,256,388.50
5. Step 5: Solve for x
   x = 1,256,388.50/1,071.72
6. Step 6: Final answer
   x = 1,172.31