Finding the Fourth Proportional to 1,399.55, 1,930.30 and 901.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.55 : 1,930.30 = 901.89 : x
2. Step 2: Convert to fraction form
   1,399.55/1,930.30 = 901.89/x
3. Step 3: Cross multiply
   1,399.55x = 1,930.30 × 901.89
4. Step 4: Simplify right side
   1,399.55x = 1,740,916.01
5. Step 5: Solve for x
   x = 1,740,916.01/1,399.55
6. Step 6: Final answer
   x = 1,243.92