Finding the Fourth Proportional to 18,786.96, 28,185.30 and 7,100.28

Step by Step Solution

1. Step 1: Write the proportion equation
   18,786.96 : 28,185.30 = 7,100.28 : x
2. Step 2: Convert to fraction form
   18,786.96/28,185.30 = 7,100.28/x
3. Step 3: Cross multiply
   18,786.96x = 28,185.30 × 7,100.28
4. Step 4: Simplify right side
   18,786.96x = 200,123,521.88
5. Step 5: Solve for x
   x = 200,123,521.88/18,786.96
6. Step 6: Final answer
   x = 10,652.26