Finding the Fourth Proportional to 28,215.54, 42,293.34 and 9,478.62

Step by Step Solution

1. Step 1: Write the proportion equation
   28,215.54 : 42,293.34 = 9,478.62 : x
2. Step 2: Convert to fraction form
   28,215.54/42,293.34 = 9,478.62/x
3. Step 3: Cross multiply
   28,215.54x = 42,293.34 × 9,478.62
4. Step 4: Simplify right side
   28,215.54x = 400,882,498.39
5. Step 5: Solve for x
   x = 400,882,498.39/28,215.54
6. Step 6: Final answer
   x = 14,207.86