Finding the Fourth Proportional to 13,618.40, 18,791.94 and 7,650.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,618.40 : 18,791.94 = 7,650.72 : x
2. Step 2: Convert to fraction form
   13,618.40/18,791.94 = 7,650.72/x
3. Step 3: Cross multiply
   13,618.40x = 18,791.94 × 7,650.72
4. Step 4: Simplify right side
   13,618.40x = 143,771,871.20
5. Step 5: Solve for x
   x = 143,771,871.20/13,618.40
6. Step 6: Final answer
   x = 10,557.18