Finding the Fourth Proportional to 7,346.31, 10,137.90 and 3,989.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,346.31 : 10,137.90 = 3,989.10 : x
2. Step 2: Convert to fraction form
   7,346.31/10,137.90 = 3,989.10/x
3. Step 3: Cross multiply
   7,346.31x = 10,137.90 × 3,989.10
4. Step 4: Simplify right side
   7,346.31x = 40,441,096.89
5. Step 5: Solve for x
   x = 40,441,096.89/7,346.31
6. Step 6: Final answer
   x = 5,504.95