Finding the Fourth Proportional to 2,013.38, 3,019.47 and 780.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.38 : 3,019.47 = 780.51 : x
2. Step 2: Convert to fraction form
   2,013.38/3,019.47 = 780.51/x
3. Step 3: Cross multiply
   2,013.38x = 3,019.47 × 780.51
4. Step 4: Simplify right side
   2,013.38x = 2,356,726.53
5. Step 5: Solve for x
   x = 2,356,726.53/2,013.38
6. Step 6: Final answer
   x = 1,170.53