Finding the Fourth Proportional to 1,131.42, 1,697.43 and 391.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.42 : 1,697.43 = 391.19 : x
2. Step 2: Convert to fraction form
   1,131.42/1,697.43 = 391.19/x
3. Step 3: Cross multiply
   1,131.42x = 1,697.43 × 391.19
4. Step 4: Simplify right side
   1,131.42x = 664,008.42
5. Step 5: Solve for x
   x = 664,008.42/1,131.42
6. Step 6: Final answer
   x = 586.88