Finding the Fourth Proportional to 13,311.16, 18,370.24 and 7,647.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,311.16 : 18,370.24 = 7,647.72 : x
2. Step 2: Convert to fraction form
   13,311.16/18,370.24 = 7,647.72/x
3. Step 3: Cross multiply
   13,311.16x = 18,370.24 × 7,647.72
4. Step 4: Simplify right side
   13,311.16x = 140,490,451.85
5. Step 5: Solve for x
   x = 140,490,451.85/13,311.16
6. Step 6: Final answer
   x = 10,554.34