Finding the Fourth Proportional to 1,433.20, 1,978.04 and 1,040.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.20 : 1,978.04 = 1,040.08 : x
2. Step 2: Convert to fraction form
   1,433.20/1,978.04 = 1,040.08/x
3. Step 3: Cross multiply
   1,433.20x = 1,978.04 × 1,040.08
4. Step 4: Simplify right side
   1,433.20x = 2,057,319.84
5. Step 5: Solve for x
   x = 2,057,319.84/1,433.20
6. Step 6: Final answer
   x = 1,435.47