Finding the Fourth Proportional to 13,146.47, 19,719.89 and 3,786.65

Step by Step Solution

1. Step 1: Write the proportion equation
   13,146.47 : 19,719.89 = 3,786.65 : x
2. Step 2: Convert to fraction form
   13,146.47/19,719.89 = 3,786.65/x
3. Step 3: Cross multiply
   13,146.47x = 19,719.89 × 3,786.65
4. Step 4: Simplify right side
   13,146.47x = 74,672,203.94
5. Step 5: Solve for x
   x = 74,672,203.94/13,146.47
6. Step 6: Final answer
   x = 5,680.02