Finding the Fourth Proportional to 28,087.59, 42,132.27 and 12,284.49

Step by Step Solution

1. Step 1: Write the proportion equation
   28,087.59 : 42,132.27 = 12,284.49 : x
2. Step 2: Convert to fraction form
   28,087.59/42,132.27 = 12,284.49/x
3. Step 3: Cross multiply
   28,087.59x = 42,132.27 × 12,284.49
4. Step 4: Simplify right side
   28,087.59x = 517,573,449.49
5. Step 5: Solve for x
   x = 517,573,449.49/28,087.59
6. Step 6: Final answer
   x = 18,427.12