Finding the Fourth Proportional to 18,978.23, 28,444.25 and 13,433.18

Step by Step Solution

1. Step 1: Write the proportion equation
   18,978.23 : 28,444.25 = 13,433.18 : x
2. Step 2: Convert to fraction form
   18,978.23/28,444.25 = 13,433.18/x
3. Step 3: Cross multiply
   18,978.23x = 28,444.25 × 13,433.18
4. Step 4: Simplify right side
   18,978.23x = 382,096,520.83
5. Step 5: Solve for x
   x = 382,096,520.83/18,978.23
6. Step 6: Final answer
   x = 20,133.42