Finding the Fourth Proportional to 28,042.24, 42,072.96 and 12,470.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,042.24 : 42,072.96 = 12,470.72 : x
2. Step 2: Convert to fraction form
   28,042.24/42,072.96 = 12,470.72/x
3. Step 3: Cross multiply
   28,042.24x = 42,072.96 × 12,470.72
4. Step 4: Simplify right side
   28,042.24x = 524,680,103.73
5. Step 5: Solve for x
   x = 524,680,103.73/28,042.24
6. Step 6: Final answer
   x = 18,710.35