Finding the Fourth Proportional to 1,391.01, 1,919.67 and 801.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.01 : 1,919.67 = 801.54 : x
2. Step 2: Convert to fraction form
   1,391.01/1,919.67 = 801.54/x
3. Step 3: Cross multiply
   1,391.01x = 1,919.67 × 801.54
4. Step 4: Simplify right side
   1,391.01x = 1,538,692.29
5. Step 5: Solve for x
   x = 1,538,692.29/1,391.01
6. Step 6: Final answer
   x = 1,106.17