Finding the Fourth Proportional to 1,231.32, 1,699.25 and 707.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,231.32 : 1,699.25 = 707.31 : x
2. Step 2: Convert to fraction form
   1,231.32/1,699.25 = 707.31/x
3. Step 3: Cross multiply
   1,231.32x = 1,699.25 × 707.31
4. Step 4: Simplify right side
   1,231.32x = 1,201,896.52
5. Step 5: Solve for x
   x = 1,201,896.52/1,231.32
6. Step 6: Final answer
   x = 976.10