Finding the Fourth Proportional to 28,141.30, 42,202.23 and 8,419.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,141.30 : 42,202.23 = 8,419.42 : x
2. Step 2: Convert to fraction form
   28,141.30/42,202.23 = 8,419.42/x
3. Step 3: Cross multiply
   28,141.30x = 42,202.23 × 8,419.42
4. Step 4: Simplify right side
   28,141.30x = 355,318,299.31
5. Step 5: Solve for x
   x = 355,318,299.31/28,141.30
6. Step 6: Final answer
   x = 12,626.22