Finding the Fourth Proportional to 3,954.58, 5,454.21 and 3,689.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,954.58 : 5,454.21 = 3,689.62 : x
2. Step 2: Convert to fraction form
   3,954.58/5,454.21 = 3,689.62/x
3. Step 3: Cross multiply
   3,954.58x = 5,454.21 × 3,689.62
4. Step 4: Simplify right side
   3,954.58x = 20,123,962.30
5. Step 5: Solve for x
   x = 20,123,962.30/3,954.58
6. Step 6: Final answer
   x = 5,088.77