Finding the Fourth Proportional to 1,131.72, 1,697.92 and 401.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.72 : 1,697.92 = 401.12 : x
2. Step 2: Convert to fraction form
   1,131.72/1,697.92 = 401.12/x
3. Step 3: Cross multiply
   1,131.72x = 1,697.92 × 401.12
4. Step 4: Simplify right side
   1,131.72x = 681,069.67
5. Step 5: Solve for x
   x = 681,069.67/1,131.72
6. Step 6: Final answer
   x = 601.80