Finding the Fourth Proportional to 1,181.05, 1,631.17 and 1,023.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,181.05 : 1,631.17 = 1,023.42 : x
2. Step 2: Convert to fraction form
   1,181.05/1,631.17 = 1,023.42/x
3. Step 3: Cross multiply
   1,181.05x = 1,631.17 × 1,023.42
4. Step 4: Simplify right side
   1,181.05x = 1,669,372.00
5. Step 5: Solve for x
   x = 1,669,372.00/1,181.05
6. Step 6: Final answer
   x = 1,413.46