Finding the Fourth Proportional to 28,078.56, 42,140.88 and 14,231.52

Step by Step Solution

1. Step 1: Write the proportion equation
   28,078.56 : 42,140.88 = 14,231.52 : x
2. Step 2: Convert to fraction form
   28,078.56/42,140.88 = 14,231.52/x
3. Step 3: Cross multiply
   28,078.56x = 42,140.88 × 14,231.52
4. Step 4: Simplify right side
   28,078.56x = 599,728,776.54
5. Step 5: Solve for x
   x = 599,728,776.54/28,078.56
6. Step 6: Final answer
   x = 21,358.96