Finding the Fourth Proportional to 1,351.72, 1,863.60 and 931.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,351.72 : 1,863.60 = 931.30 : x
2. Step 2: Convert to fraction form
   1,351.72/1,863.60 = 931.30/x
3. Step 3: Cross multiply
   1,351.72x = 1,863.60 × 931.30
4. Step 4: Simplify right side
   1,351.72x = 1,735,570.68
5. Step 5: Solve for x
   x = 1,735,570.68/1,351.72
6. Step 6: Final answer
   x = 1,283.97