Finding the Fourth Proportional to 1,131.81, 1,697.25 and 400.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.81 : 1,697.25 = 400.98 : x
2. Step 2: Convert to fraction form
   1,131.81/1,697.25 = 400.98/x
3. Step 3: Cross multiply
   1,131.81x = 1,697.25 × 400.98
4. Step 4: Simplify right side
   1,131.81x = 680,571.17
5. Step 5: Solve for x
   x = 680,571.17/1,131.81
6. Step 6: Final answer
   x = 601.31