Finding the Fourth Proportional to 2,013.89, 3,020.24 and 781.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.89 : 3,020.24 = 781.02 : x
2. Step 2: Convert to fraction form
   2,013.89/3,020.24 = 781.02/x
3. Step 3: Cross multiply
   2,013.89x = 3,020.24 × 781.02
4. Step 4: Simplify right side
   2,013.89x = 2,358,863.94
5. Step 5: Solve for x
   x = 2,358,863.94/2,013.89
6. Step 6: Final answer
   x = 1,171.30