Finding the Fourth Proportional to 12,388.09, 17,109.76 and 8,158.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,388.09 : 17,109.76 = 8,158.06 : x
2. Step 2: Convert to fraction form
   12,388.09/17,109.76 = 8,158.06/x
3. Step 3: Cross multiply
   12,388.09x = 17,109.76 × 8,158.06
4. Step 4: Simplify right side
   12,388.09x = 139,582,448.67
5. Step 5: Solve for x
   x = 139,582,448.67/12,388.09
6. Step 6: Final answer
   x = 11,267.47