Finding the Fourth Proportional to 1,131.45, 1,696.69 and 400.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.45 : 1,696.69 = 400.86 : x
2. Step 2: Convert to fraction form
   1,131.45/1,696.69 = 400.86/x
3. Step 3: Cross multiply
   1,131.45x = 1,696.69 × 400.86
4. Step 4: Simplify right side
   1,131.45x = 680,135.15
5. Step 5: Solve for x
   x = 680,135.15/1,131.45
6. Step 6: Final answer
   x = 601.12