Finding the Fourth Proportional to 1,231.63, 1,699.63 and 672.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,231.63 : 1,699.63 = 672.10 : x
2. Step 2: Convert to fraction form
   1,231.63/1,699.63 = 672.10/x
3. Step 3: Cross multiply
   1,231.63x = 1,699.63 × 672.10
4. Step 4: Simplify right side
   1,231.63x = 1,142,321.32
5. Step 5: Solve for x
   x = 1,142,321.32/1,231.63
6. Step 6: Final answer
   x = 927.49