Finding the Fourth Proportional to 1,131.79, 1,697.69 and 401.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.79 : 1,697.69 = 401.39 : x
2. Step 2: Convert to fraction form
   1,131.79/1,697.69 = 401.39/x
3. Step 3: Cross multiply
   1,131.79x = 1,697.69 × 401.39
4. Step 4: Simplify right side
   1,131.79x = 681,431.04
5. Step 5: Solve for x
   x = 681,431.04/1,131.79
6. Step 6: Final answer
   x = 602.08