Finding the Fourth Proportional to 18,705.60, 28,061.34 and 7,019.68

Step by Step Solution

1. Step 1: Write the proportion equation
   18,705.60 : 28,061.34 = 7,019.68 : x
2. Step 2: Convert to fraction form
   18,705.60/28,061.34 = 7,019.68/x
3. Step 3: Cross multiply
   18,705.60x = 28,061.34 × 7,019.68
4. Step 4: Simplify right side
   18,705.60x = 196,981,627.17
5. Step 5: Solve for x
   x = 196,981,627.17/18,705.60
6. Step 6: Final answer
   x = 10,530.62