Finding the Fourth Proportional to 12,966.30, 17,893.72 and 7,661.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,966.30 : 17,893.72 = 7,661.10 : x
2. Step 2: Convert to fraction form
   12,966.30/17,893.72 = 7,661.10/x
3. Step 3: Cross multiply
   12,966.30x = 17,893.72 × 7,661.10
4. Step 4: Simplify right side
   12,966.30x = 137,085,654.97
5. Step 5: Solve for x
   x = 137,085,654.97/12,966.30
6. Step 6: Final answer
   x = 10,572.46