Finding the Fourth Proportional to 9,158.05, 12,638.35 and 5,179.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158.05 : 12,638.35 = 5,179.75 : x
2. Step 2: Convert to fraction form
   9,158.05/12,638.35 = 5,179.75/x
3. Step 3: Cross multiply
   9,158.05x = 12,638.35 × 5,179.75
4. Step 4: Simplify right side
   9,158.05x = 65,463,493.41
5. Step 5: Solve for x
   x = 65,463,493.41/9,158.05
6. Step 6: Final answer
   x = 7,148.19