Finding the Fourth Proportional to 19,665.92, 29,505.28 and 13,118.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,665.92 : 29,505.28 = 13,118.72 : x
2. Step 2: Convert to fraction form
   19,665.92/29,505.28 = 13,118.72/x
3. Step 3: Cross multiply
   19,665.92x = 29,505.28 × 13,118.72
4. Step 4: Simplify right side
   19,665.92x = 387,071,506.84
5. Step 5: Solve for x
   x = 387,071,506.84/19,665.92
6. Step 6: Final answer
   x = 19,682.35