Finding the Fourth Proportional to 13,020, 19,530.72 and 3,786.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,020 : 19,530.72 = 3,786.72 : x
2. Step 2: Convert to fraction form
   13,020/19,530.72 = 3,786.72/x
3. Step 3: Cross multiply
   13,020x = 19,530.72 × 3,786.72
4. Step 4: Simplify right side
   13,020x = 73,957,368.04
5. Step 5: Solve for x
   x = 73,957,368.04/13,020
6. Step 6: Final answer
   x = 5,680.29