Finding the Fourth Proportional to 3,715.83, 5,128.61 and 2,143.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,715.83 : 5,128.61 = 2,143.71 : x
2. Step 2: Convert to fraction form
   3,715.83/5,128.61 = 2,143.71/x
3. Step 3: Cross multiply
   3,715.83x = 5,128.61 × 2,143.71
4. Step 4: Simplify right side
   3,715.83x = 10,994,241.82
5. Step 5: Solve for x
   x = 10,994,241.82/3,715.83
6. Step 6: Final answer
   x = 2,958.76