Finding the Fourth Proportional to 1,399.31, 1,930.59 and 901.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.31 : 1,930.59 = 901.07 : x
2. Step 2: Convert to fraction form
   1,399.31/1,930.59 = 901.07/x
3. Step 3: Cross multiply
   1,399.31x = 1,930.59 × 901.07
4. Step 4: Simplify right side
   1,399.31x = 1,739,587.08
5. Step 5: Solve for x
   x = 1,739,587.08/1,399.31
6. Step 6: Final answer
   x = 1,243.18