Finding the Fourth Proportional to 28,209.50, 42,318.72 and 11,342.46

Step by Step Solution

1. Step 1: Write the proportion equation
   28,209.50 : 42,318.72 = 11,342.46 : x
2. Step 2: Convert to fraction form
   28,209.50/42,318.72 = 11,342.46/x
3. Step 3: Cross multiply
   28,209.50x = 42,318.72 × 11,342.46
4. Step 4: Simplify right side
   28,209.50x = 479,998,388.85
5. Step 5: Solve for x
   x = 479,998,388.85/28,209.50
6. Step 6: Final answer
   x = 17,015.49