Finding the Fourth Proportional to 28,141.04, 42,199.56 and 8,419.28

Step by Step Solution

1. Step 1: Write the proportion equation
   28,141.04 : 42,199.56 = 8,419.28 : x
2. Step 2: Convert to fraction form
   28,141.04/42,199.56 = 8,419.28/x
3. Step 3: Cross multiply
   28,141.04x = 42,199.56 × 8,419.28
4. Step 4: Simplify right side
   28,141.04x = 355,289,911.52
5. Step 5: Solve for x
   x = 355,289,911.52/28,141.04
6. Step 6: Final answer
   x = 12,625.33