Finding the Fourth Proportional to 1,205.27, 1,807.89 and 383.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,205.27 : 1,807.89 = 383.31 : x
2. Step 2: Convert to fraction form
   1,205.27/1,807.89 = 383.31/x
3. Step 3: Cross multiply
   1,205.27x = 1,807.89 × 383.31
4. Step 4: Simplify right side
   1,205.27x = 692,982.32
5. Step 5: Solve for x
   x = 692,982.32/1,205.27
6. Step 6: Final answer
   x = 574.96