Finding the Fourth Proportional to 3,405.78, 5,109.48 and 1,097.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,405.78 : 5,109.48 = 1,097.28 : x
2. Step 2: Convert to fraction form
   3,405.78/5,109.48 = 1,097.28/x
3. Step 3: Cross multiply
   3,405.78x = 5,109.48 × 1,097.28
4. Step 4: Simplify right side
   3,405.78x = 5,606,530.21
5. Step 5: Solve for x
   x = 5,606,530.21/3,405.78
6. Step 6: Final answer
   x = 1,646.18