Finding the Fourth Proportional to 3,628.56, 5,442.72 and 1,320

Step by Step Solution

1. Step 1: Write the proportion equation
   3,628.56 : 5,442.72 = 1,320 : x
2. Step 2: Convert to fraction form
   3,628.56/5,442.72 = 1,320/x
3. Step 3: Cross multiply
   3,628.56x = 5,442.72 × 1,320
4. Step 4: Simplify right side
   3,628.56x = 7,184,390.40
5. Step 5: Solve for x
   x = 7,184,390.40/3,628.56
6. Step 6: Final answer
   x = 1,979.96