Finding the Fourth Proportional to 12,671.80, 17,489.28 and 7,369.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,671.80 : 17,489.28 = 7,369.72 : x
2. Step 2: Convert to fraction form
   12,671.80/17,489.28 = 7,369.72/x
3. Step 3: Cross multiply
   12,671.80x = 17,489.28 × 7,369.72
4. Step 4: Simplify right side
   12,671.80x = 128,891,096.60
5. Step 5: Solve for x
   x = 128,891,096.60/12,671.80
6. Step 6: Final answer
   x = 10,171.49