Finding the Fourth Proportional to 42,439.72, 63,669.43 and 12,452.75

Step by Step Solution

1. Step 1: Write the proportion equation
   42,439.72 : 63,669.43 = 12,452.75 : x
2. Step 2: Convert to fraction form
   42,439.72/63,669.43 = 12,452.75/x
3. Step 3: Cross multiply
   42,439.72x = 63,669.43 × 12,452.75
4. Step 4: Simplify right side
   42,439.72x = 792,859,494.43
5. Step 5: Solve for x
   x = 792,859,494.43/42,439.72
6. Step 6: Final answer
   x = 18,682.02