Finding the Fourth Proportional to 13,127.56, 18,105.79 and 8,412.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,127.56 : 18,105.79 = 8,412.28 : x
2. Step 2: Convert to fraction form
   13,127.56/18,105.79 = 8,412.28/x
3. Step 3: Cross multiply
   13,127.56x = 18,105.79 × 8,412.28
4. Step 4: Simplify right side
   13,127.56x = 152,310,842.51
5. Step 5: Solve for x
   x = 152,310,842.51/13,127.56
6. Step 6: Final answer
   x = 11,602.38