Finding the Fourth Proportional to 2,288.31, 3,157.88 and 1,240.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.31 : 3,157.88 = 1,240.38 : x
2. Step 2: Convert to fraction form
   2,288.31/3,157.88 = 1,240.38/x
3. Step 3: Cross multiply
   2,288.31x = 3,157.88 × 1,240.38
4. Step 4: Simplify right side
   2,288.31x = 3,916,971.19
5. Step 5: Solve for x
   x = 3,916,971.19/2,288.31
6. Step 6: Final answer
   x = 1,711.73