Finding the Fourth Proportional to 1,399.37, 1,931.31 and 801.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.37 : 1,931.31 = 801.75 : x
2. Step 2: Convert to fraction form
   1,399.37/1,931.31 = 801.75/x
3. Step 3: Cross multiply
   1,399.37x = 1,931.31 × 801.75
4. Step 4: Simplify right side
   1,399.37x = 1,548,427.79
5. Step 5: Solve for x
   x = 1,548,427.79/1,399.37
6. Step 6: Final answer
   x = 1,106.52