Finding the Fourth Proportional to 1,103.24, 1,653.69 and 399.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.24 : 1,653.69 = 399.98 : x
2. Step 2: Convert to fraction form
   1,103.24/1,653.69 = 399.98/x
3. Step 3: Cross multiply
   1,103.24x = 1,653.69 × 399.98
4. Step 4: Simplify right side
   1,103.24x = 661,442.93
5. Step 5: Solve for x
   x = 661,442.93/1,103.24
6. Step 6: Final answer
   x = 599.55