Finding the Fourth Proportional to 1,323.11, 1,980.72 and 801.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,323.11 : 1,980.72 = 801.54 : x
2. Step 2: Convert to fraction form
   1,323.11/1,980.72 = 801.54/x
3. Step 3: Cross multiply
   1,323.11x = 1,980.72 × 801.54
4. Step 4: Simplify right side
   1,323.11x = 1,587,626.31
5. Step 5: Solve for x
   x = 1,587,626.31/1,323.11
6. Step 6: Final answer
   x = 1,199.92