Finding the Fourth Proportional to 28,104.71, 42,142.82 and 9,378.05

Step by Step Solution

1. Step 1: Write the proportion equation
   28,104.71 : 42,142.82 = 9,378.05 : x
2. Step 2: Convert to fraction form
   28,104.71/42,142.82 = 9,378.05/x
3. Step 3: Cross multiply
   28,104.71x = 42,142.82 × 9,378.05
4. Step 4: Simplify right side
   28,104.71x = 395,217,215.50
5. Step 5: Solve for x
   x = 395,217,215.50/28,104.71
6. Step 6: Final answer
   x = 14,062.32