Finding the Fourth Proportional to 3,697.31, 5,099.25 and 3,139.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,697.31 : 5,099.25 = 3,139.22 : x
2. Step 2: Convert to fraction form
   3,697.31/5,099.25 = 3,139.22/x
3. Step 3: Cross multiply
   3,697.31x = 5,099.25 × 3,139.22
4. Step 4: Simplify right side
   3,697.31x = 16,007,692.11
5. Step 5: Solve for x
   x = 16,007,692.11/3,697.31
6. Step 6: Final answer
   x = 4,329.55