Finding the Fourth Proportional to 42,227.05, 63,340.71 and 12,645.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,227.05 : 63,340.71 = 12,645.04 : x
2. Step 2: Convert to fraction form
   42,227.05/63,340.71 = 12,645.04/x
3. Step 3: Cross multiply
   42,227.05x = 63,340.71 × 12,645.04
4. Step 4: Simplify right side
   42,227.05x = 800,945,811.58
5. Step 5: Solve for x
   x = 800,945,811.58/42,227.05
6. Step 6: Final answer
   x = 18,967.60