Finding the Fourth Proportional to 28,015, 42,023.31 and 7,238.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,015 : 42,023.31 = 7,238.50 : x
2. Step 2: Convert to fraction form
   28,015/42,023.31 = 7,238.50/x
3. Step 3: Cross multiply
   28,015x = 42,023.31 × 7,238.50
4. Step 4: Simplify right side
   28,015x = 304,185,729.44
5. Step 5: Solve for x
   x = 304,185,729.44/28,015
6. Step 6: Final answer
   x = 10,857.96