Finding the Fourth Proportional to 3,689.45, 5,504.86 and 3,428.16

Step by Step Solution

1. Step 1: Write the proportion equation
   3,689.45 : 5,504.86 = 3,428.16 : x
2. Step 2: Convert to fraction form
   3,689.45/5,504.86 = 3,428.16/x
3. Step 3: Cross multiply
   3,689.45x = 5,504.86 × 3,428.16
4. Step 4: Simplify right side
   3,689.45x = 18,871,540.86
5. Step 5: Solve for x
   x = 18,871,540.86/3,689.45
6. Step 6: Final answer
   x = 5,115.00