Finding the Fourth Proportional to 3,407.78, 5,112.48 and 1,099.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,407.78 : 5,112.48 = 1,099.28 : x
2. Step 2: Convert to fraction form
   3,407.78/5,112.48 = 1,099.28/x
3. Step 3: Cross multiply
   3,407.78x = 5,112.48 × 1,099.28
4. Step 4: Simplify right side
   3,407.78x = 5,620,047.01
5. Step 5: Solve for x
   x = 5,620,047.01/3,407.78
6. Step 6: Final answer
   x = 1,649.18