Finding the Fourth Proportional to 1,431.58, 1,975.15 and 871.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.58 : 1,975.15 = 871.73 : x
2. Step 2: Convert to fraction form
   1,431.58/1,975.15 = 871.73/x
3. Step 3: Cross multiply
   1,431.58x = 1,975.15 × 871.73
4. Step 4: Simplify right side
   1,431.58x = 1,721,797.51
5. Step 5: Solve for x
   x = 1,721,797.51/1,431.58
6. Step 6: Final answer
   x = 1,202.73