Finding the Fourth Proportional to 1,393.16, 1,921.20 and 1,183.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.16 : 1,921.20 = 1,183.10 : x
2. Step 2: Convert to fraction form
   1,393.16/1,921.20 = 1,183.10/x
3. Step 3: Cross multiply
   1,393.16x = 1,921.20 × 1,183.10
4. Step 4: Simplify right side
   1,393.16x = 2,272,971.72
5. Step 5: Solve for x
   x = 2,272,971.72/1,393.16
6. Step 6: Final answer
   x = 1,631.52