Finding the Fourth Proportional to 42,440.37, 63,645.50 and 12,446.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,440.37 : 63,645.50 = 12,446.28 : x
2. Step 2: Convert to fraction form
   42,440.37/63,645.50 = 12,446.28/x
3. Step 3: Cross multiply
   42,440.37x = 63,645.50 × 12,446.28
4. Step 4: Simplify right side
   42,440.37x = 792,149,651.51
5. Step 5: Solve for x
   x = 792,149,651.51/42,440.37
6. Step 6: Final answer
   x = 18,665.00