Finding the Fourth Proportional to 19,904.64, 27,469.76 and 13,178.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,904.64 : 27,469.76 = 13,178.72 : x
2. Step 2: Convert to fraction form
   19,904.64/27,469.76 = 13,178.72/x
3. Step 3: Cross multiply
   19,904.64x = 27,469.76 × 13,178.72
4. Step 4: Simplify right side
   19,904.64x = 362,016,275.51
5. Step 5: Solve for x
   x = 362,016,275.51/19,904.64
6. Step 6: Final answer
   x = 18,187.53