Finding the Fourth Proportional to 13,978.09, 19,289.78 and 8,009.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.09 : 19,289.78 = 8,009.88 : x
2. Step 2: Convert to fraction form
   13,978.09/19,289.78 = 8,009.88/x
3. Step 3: Cross multiply
   13,978.09x = 19,289.78 × 8,009.88
4. Step 4: Simplify right side
   13,978.09x = 154,508,823.03
5. Step 5: Solve for x
   x = 154,508,823.03/13,978.09
6. Step 6: Final answer
   x = 11,053.64