Finding the Fourth Proportional to 28,082.89, 42,137.49 and 12,285.88

Step by Step Solution

1. Step 1: Write the proportion equation
   28,082.89 : 42,137.49 = 12,285.88 : x
2. Step 2: Convert to fraction form
   28,082.89/42,137.49 = 12,285.88/x
3. Step 3: Cross multiply
   28,082.89x = 42,137.49 × 12,285.88
4. Step 4: Simplify right side
   28,082.89x = 517,696,145.64
5. Step 5: Solve for x
   x = 517,696,145.64/28,082.89
6. Step 6: Final answer
   x = 18,434.58