Finding the Fourth Proportional to 1,397.56, 1,928.71 and 800.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.56 : 1,928.71 = 800.11 : x
2. Step 2: Convert to fraction form
   1,397.56/1,928.71 = 800.11/x
3. Step 3: Cross multiply
   1,397.56x = 1,928.71 × 800.11
4. Step 4: Simplify right side
   1,397.56x = 1,543,180.16
5. Step 5: Solve for x
   x = 1,543,180.16/1,397.56
6. Step 6: Final answer
   x = 1,104.20