Finding the Fourth Proportional to 13,615.51, 18,789.41 and 7,647.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,615.51 : 18,789.41 = 7,647.56 : x
2. Step 2: Convert to fraction form
   13,615.51/18,789.41 = 7,647.56/x
3. Step 3: Cross multiply
   13,615.51x = 18,789.41 × 7,647.56
4. Step 4: Simplify right side
   13,615.51x = 143,693,206.43
5. Step 5: Solve for x
   x = 143,693,206.43/13,615.51
6. Step 6: Final answer
   x = 10,553.64