Finding the Fourth Proportional to 1,231.69, 1,699.72 and 672.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,231.69 : 1,699.72 = 672.14 : x
2. Step 2: Convert to fraction form
   1,231.69/1,699.72 = 672.14/x
3. Step 3: Cross multiply
   1,231.69x = 1,699.72 × 672.14
4. Step 4: Simplify right side
   1,231.69x = 1,142,452.37
5. Step 5: Solve for x
   x = 1,142,452.37/1,231.69
6. Step 6: Final answer
   x = 927.55