Finding the Fourth Proportional to 13,629.94, 18,810.42 and 7,889.33

Step by Step Solution

1. Step 1: Write the proportion equation
   13,629.94 : 18,810.42 = 7,889.33 : x
2. Step 2: Convert to fraction form
   13,629.94/18,810.42 = 7,889.33/x
3. Step 3: Cross multiply
   13,629.94x = 18,810.42 × 7,889.33
4. Step 4: Simplify right side
   13,629.94x = 148,401,610.82
5. Step 5: Solve for x
   x = 148,401,610.82/13,629.94
6. Step 6: Final answer
   x = 10,887.92