Finding the Fourth Proportional to 12,135, 16,734.56 and 7,887.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,135 : 16,734.56 = 7,887.21 : x
2. Step 2: Convert to fraction form
   12,135/16,734.56 = 7,887.21/x
3. Step 3: Cross multiply
   12,135x = 16,734.56 × 7,887.21
4. Step 4: Simplify right side
   12,135x = 131,988,949.54
5. Step 5: Solve for x
   x = 131,988,949.54/12,135
6. Step 6: Final answer
   x = 10,876.72