Finding the Fourth Proportional to 13,277.76, 18,300.96 and 9,078.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,277.76 : 18,300.96 = 9,078.72 : x
2. Step 2: Convert to fraction form
   13,277.76/18,300.96 = 9,078.72/x
3. Step 3: Cross multiply
   13,277.76x = 18,300.96 × 9,078.72
4. Step 4: Simplify right side
   13,277.76x = 166,149,291.57
5. Step 5: Solve for x
   x = 166,149,291.57/13,277.76
6. Step 6: Final answer
   x = 12,513.35