Finding the Fourth Proportional to 2,013.40, 3,019.20 and 918.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.40 : 3,019.20 = 918.10 : x
2. Step 2: Convert to fraction form
   2,013.40/3,019.20 = 918.10/x
3. Step 3: Cross multiply
   2,013.40x = 3,019.20 × 918.10
4. Step 4: Simplify right side
   2,013.40x = 2,771,927.52
5. Step 5: Solve for x
   x = 2,771,927.52/2,013.40
6. Step 6: Final answer
   x = 1,376.74