Finding the Fourth Proportional to 1,601.31, 2,399.24 and 869.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,601.31 : 2,399.24 = 869.58 : x
2. Step 2: Convert to fraction form
   1,601.31/2,399.24 = 869.58/x
3. Step 3: Cross multiply
   1,601.31x = 2,399.24 × 869.58
4. Step 4: Simplify right side
   1,601.31x = 2,086,328.40
5. Step 5: Solve for x
   x = 2,086,328.40/1,601.31
6. Step 6: Final answer
   x = 1,302.89