Finding the Fourth Proportional to 12,141.21, 16,746.69 and 7,661.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,141.21 : 16,746.69 = 7,661.21 : x
2. Step 2: Convert to fraction form
   12,141.21/16,746.69 = 7,661.21/x
3. Step 3: Cross multiply
   12,141.21x = 16,746.69 × 7,661.21
4. Step 4: Simplify right side
   12,141.21x = 128,299,825.16
5. Step 5: Solve for x
   x = 128,299,825.16/12,141.21
6. Step 6: Final answer
   x = 10,567.30