Finding the Fourth Proportional to 18,998.16, 28,499.55 and 7,912.38

Step by Step Solution

1. Step 1: Write the proportion equation
   18,998.16 : 28,499.55 = 7,912.38 : x
2. Step 2: Convert to fraction form
   18,998.16/28,499.55 = 7,912.38/x
3. Step 3: Cross multiply
   18,998.16x = 28,499.55 × 7,912.38
4. Step 4: Simplify right side
   18,998.16x = 225,499,269.43
5. Step 5: Solve for x
   x = 225,499,269.43/18,998.16
6. Step 6: Final answer
   x = 11,869.53