Finding the Fourth Proportional to 1,231.59, 1,699.57 and 672.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,231.59 : 1,699.57 = 672.06 : x
2. Step 2: Convert to fraction form
   1,231.59/1,699.57 = 672.06/x
3. Step 3: Cross multiply
   1,231.59x = 1,699.57 × 672.06
4. Step 4: Simplify right side
   1,231.59x = 1,142,213.01
5. Step 5: Solve for x
   x = 1,142,213.01/1,231.59
6. Step 6: Final answer
   x = 927.43