Finding the Fourth Proportional to 12,348.72, 17,043.89 and 7,871.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,348.72 : 17,043.89 = 7,871.45 : x
2. Step 2: Convert to fraction form
   12,348.72/17,043.89 = 7,871.45/x
3. Step 3: Cross multiply
   12,348.72x = 17,043.89 × 7,871.45
4. Step 4: Simplify right side
   12,348.72x = 134,160,003.36
5. Step 5: Solve for x
   x = 134,160,003.36/12,348.72
6. Step 6: Final answer
   x = 10,864.28