Finding the Fourth Proportional to 1,399.82, 1,930.70 and 926.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.82 : 1,930.70 = 926.88 : x
2. Step 2: Convert to fraction form
   1,399.82/1,930.70 = 926.88/x
3. Step 3: Cross multiply
   1,399.82x = 1,930.70 × 926.88
4. Step 4: Simplify right side
   1,399.82x = 1,789,527.22
5. Step 5: Solve for x
   x = 1,789,527.22/1,399.82
6. Step 6: Final answer
   x = 1,278.40