Finding the Fourth Proportional to 42,069.46, 63,105.10 and 12,489.37

Step by Step Solution

1. Step 1: Write the proportion equation
   42,069.46 : 63,105.10 = 12,489.37 : x
2. Step 2: Convert to fraction form
   42,069.46/63,105.10 = 12,489.37/x
3. Step 3: Cross multiply
   42,069.46x = 63,105.10 × 12,489.37
4. Step 4: Simplify right side
   42,069.46x = 788,142,942.79
5. Step 5: Solve for x
   x = 788,142,942.79/42,069.46
6. Step 6: Final answer
   x = 18,734.33