Finding the Fourth Proportional to 1,370.27, 2,054.31 and 931.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,370.27 : 2,054.31 = 931.67 : x
2. Step 2: Convert to fraction form
   1,370.27/2,054.31 = 931.67/x
3. Step 3: Cross multiply
   1,370.27x = 2,054.31 × 931.67
4. Step 4: Simplify right side
   1,370.27x = 1,913,945.48
5. Step 5: Solve for x
   x = 1,913,945.48/1,370.27
6. Step 6: Final answer
   x = 1,396.76