Finding the Fourth Proportional to 3,619.82, 5,430.41 and 1,428.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,619.82 : 5,430.41 = 1,428.57 : x
2. Step 2: Convert to fraction form
   3,619.82/5,430.41 = 1,428.57/x
3. Step 3: Cross multiply
   3,619.82x = 5,430.41 × 1,428.57
4. Step 4: Simplify right side
   3,619.82x = 7,757,724.39
5. Step 5: Solve for x
   x = 7,757,724.39/3,619.82
6. Step 6: Final answer
   x = 2,143.12