Finding the Fourth Proportional to 1,433.76, 1,978.72 and 804.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.76 : 1,978.72 = 804.40 : x
2. Step 2: Convert to fraction form
   1,433.76/1,978.72 = 804.40/x
3. Step 3: Cross multiply
   1,433.76x = 1,978.72 × 804.40
4. Step 4: Simplify right side
   1,433.76x = 1,591,682.37
5. Step 5: Solve for x
   x = 1,591,682.37/1,433.76
6. Step 6: Final answer
   x = 1,110.15