Finding the Fourth Proportional to 1,131.89, 1,697.00 and 391.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.89 : 1,697.00 = 391.37 : x
2. Step 2: Convert to fraction form
   1,131.89/1,697.00 = 391.37/x
3. Step 3: Cross multiply
   1,131.89x = 1,697.00 × 391.37
4. Step 4: Simplify right side
   1,131.89x = 664,144.45
5. Step 5: Solve for x
   x = 664,144.45/1,131.89
6. Step 6: Final answer
   x = 586.76