Finding the Fourth Proportional to 1,131.45, 1,697.31 and 401.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.45 : 1,697.31 = 401.10 : x
2. Step 2: Convert to fraction form
   1,131.45/1,697.31 = 401.10/x
3. Step 3: Cross multiply
   1,131.45x = 1,697.31 × 401.10
4. Step 4: Simplify right side
   1,131.45x = 680,791.04
5. Step 5: Solve for x
   x = 680,791.04/1,131.45
6. Step 6: Final answer
   x = 601.70