Finding the Fourth Proportional to 9,078.38, 12,518.67 and 7,186.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,078.38 : 12,518.67 = 7,186.94 : x
2. Step 2: Convert to fraction form
   9,078.38/12,518.67 = 7,186.94/x
3. Step 3: Cross multiply
   9,078.38x = 12,518.67 × 7,186.94
4. Step 4: Simplify right side
   9,078.38x = 89,970,930.17
5. Step 5: Solve for x
   x = 89,970,930.17/9,078.38
6. Step 6: Final answer
   x = 9,910.46