Finding the Fourth Proportional to 2,013.98, 3,020.20 and 781.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.98 : 3,020.20 = 781.23 : x
2. Step 2: Convert to fraction form
   2,013.98/3,020.20 = 781.23/x
3. Step 3: Cross multiply
   2,013.98x = 3,020.20 × 781.23
4. Step 4: Simplify right side
   2,013.98x = 2,359,455.49
5. Step 5: Solve for x
   x = 2,359,455.49/2,013.98
6. Step 6: Final answer
   x = 1,171.54