Finding the Fourth Proportional to 12,078.58, 18,086.94 and 7,151.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,078.58 : 18,086.94 = 7,151.76 : x
2. Step 2: Convert to fraction form
   12,078.58/18,086.94 = 7,151.76/x
3. Step 3: Cross multiply
   12,078.58x = 18,086.94 × 7,151.76
4. Step 4: Simplify right side
   12,078.58x = 129,353,454.01
5. Step 5: Solve for x
   x = 129,353,454.01/12,078.58
6. Step 6: Final answer
   x = 10,709.33