Finding the Fourth Proportional to 12,443.90, 18,635.99 and 7,162.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.90 : 18,635.99 = 7,162.88 : x
2. Step 2: Convert to fraction form
   12,443.90/18,635.99 = 7,162.88/x
3. Step 3: Cross multiply
   12,443.90x = 18,635.99 × 7,162.88
4. Step 4: Simplify right side
   12,443.90x = 133,487,231.06
5. Step 5: Solve for x
   x = 133,487,231.06/12,443.90
6. Step 6: Final answer
   x = 10,727.13