Finding the Fourth Proportional to 3,890.58, 5,369.67 and 3,715.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,890.58 : 5,369.67 = 3,715.62 : x
2. Step 2: Convert to fraction form
   3,890.58/5,369.67 = 3,715.62/x
3. Step 3: Cross multiply
   3,890.58x = 5,369.67 × 3,715.62
4. Step 4: Simplify right side
   3,890.58x = 19,951,653.25
5. Step 5: Solve for x
   x = 19,951,653.25/3,890.58
6. Step 6: Final answer
   x = 5,128.20