Finding the Fourth Proportional to 20,555.34, 28,336.72 and 13,469.46

Step by Step Solution

1. Step 1: Write the proportion equation
   20,555.34 : 28,336.72 = 13,469.46 : x
2. Step 2: Convert to fraction form
   20,555.34/28,336.72 = 13,469.46/x
3. Step 3: Cross multiply
   20,555.34x = 28,336.72 × 13,469.46
4. Step 4: Simplify right side
   20,555.34x = 381,680,316.57
5. Step 5: Solve for x
   x = 381,680,316.57/20,555.34
6. Step 6: Final answer
   x = 18,568.43