Finding the Fourth Proportional to 2,019.81, 3,030.93 and 865.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,019.81 : 3,030.93 = 865.56 : x
2. Step 2: Convert to fraction form
   2,019.81/3,030.93 = 865.56/x
3. Step 3: Cross multiply
   2,019.81x = 3,030.93 × 865.56
4. Step 4: Simplify right side
   2,019.81x = 2,623,451.77
5. Step 5: Solve for x
   x = 2,623,451.77/2,019.81
6. Step 6: Final answer
   x = 1,298.86