Finding the Fourth Proportional to 28,439.30, 42,661.69 and 8,714.39

Step by Step Solution

1. Step 1: Write the proportion equation
   28,439.30 : 42,661.69 = 8,714.39 : x
2. Step 2: Convert to fraction form
   28,439.30/42,661.69 = 8,714.39/x
3. Step 3: Cross multiply
   28,439.30x = 42,661.69 × 8,714.39
4. Step 4: Simplify right side
   28,439.30x = 371,770,369.62
5. Step 5: Solve for x
   x = 371,770,369.62/28,439.30
6. Step 6: Final answer
   x = 13,072.42