Finding the Fourth Proportional to 12,443.67, 17,170.89 and 7,407.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.67 : 17,170.89 = 7,407.21 : x
2. Step 2: Convert to fraction form
   12,443.67/17,170.89 = 7,407.21/x
3. Step 3: Cross multiply
   12,443.67x = 17,170.89 × 7,407.21
4. Step 4: Simplify right side
   12,443.67x = 127,188,388.12
5. Step 5: Solve for x
   x = 127,188,388.12/12,443.67
6. Step 6: Final answer
   x = 10,221.13