Finding the Fourth Proportional to 1,431.05, 1,974.27 and 871.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.05 : 1,974.27 = 871.07 : x
2. Step 2: Convert to fraction form
   1,431.05/1,974.27 = 871.07/x
3. Step 3: Cross multiply
   1,431.05x = 1,974.27 × 871.07
4. Step 4: Simplify right side
   1,431.05x = 1,719,717.50
5. Step 5: Solve for x
   x = 1,719,717.50/1,431.05
6. Step 6: Final answer
   x = 1,201.72