Finding the Fourth Proportional to 2,175.31, 3,001.71 and 1,231.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,175.31 : 3,001.71 = 1,231.12 : x
2. Step 2: Convert to fraction form
   2,175.31/3,001.71 = 1,231.12/x
3. Step 3: Cross multiply
   2,175.31x = 3,001.71 × 1,231.12
4. Step 4: Simplify right side
   2,175.31x = 3,695,449.77
5. Step 5: Solve for x
   x = 3,695,449.77/2,175.31
6. Step 6: Final answer
   x = 1,698.82