Finding the Fourth Proportional to 2,240.89, 3,090.42 and 1,355.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,240.89 : 3,090.42 = 1,355.15 : x
2. Step 2: Convert to fraction form
   2,240.89/3,090.42 = 1,355.15/x
3. Step 3: Cross multiply
   2,240.89x = 3,090.42 × 1,355.15
4. Step 4: Simplify right side
   2,240.89x = 4,187,990.39
5. Step 5: Solve for x
   x = 4,187,990.39/2,240.89
6. Step 6: Final answer
   x = 1,868.90