Finding the Fourth Proportional to 789.72, 1,185.31 and 400.00

Step by Step Solution

1. Step 1: Write the proportion equation
   789.72 : 1,185.31 = 400.00 : x
2. Step 2: Convert to fraction form
   789.72/1,185.31 = 400.00/x
3. Step 3: Cross multiply
   789.72x = 1,185.31 × 400.00
4. Step 4: Simplify right side
   789.72x = 474,121.55
5. Step 5: Solve for x
   x = 474,121.55/789.72
6. Step 6: Final answer
   x = 600.37