Finding the Fourth Proportional to 1,399.28, 1,930.61 and 901.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.28 : 1,930.61 = 901.73 : x
2. Step 2: Convert to fraction form
   1,399.28/1,930.61 = 901.73/x
3. Step 3: Cross multiply
   1,399.28x = 1,930.61 × 901.73
4. Step 4: Simplify right side
   1,399.28x = 1,740,874.79
5. Step 5: Solve for x
   x = 1,740,874.79/1,399.28
6. Step 6: Final answer
   x = 1,244.13