Finding the Fourth Proportional to 28,057.76, 42,081.60 and 9,338.12

Step by Step Solution

1. Step 1: Write the proportion equation
   28,057.76 : 42,081.60 = 9,338.12 : x
2. Step 2: Convert to fraction form
   28,057.76/42,081.60 = 9,338.12/x
3. Step 3: Cross multiply
   28,057.76x = 42,081.60 × 9,338.12
4. Step 4: Simplify right side
   28,057.76x = 392,963,030.59
5. Step 5: Solve for x
   x = 392,963,030.59/28,057.76
6. Step 6: Final answer
   x = 14,005.50