Finding the Fourth Proportional to 42,438.72, 63,667.93 and 12,451.75

Step by Step Solution

1. Step 1: Write the proportion equation
   42,438.72 : 63,667.93 = 12,451.75 : x
2. Step 2: Convert to fraction form
   42,438.72/63,667.93 = 12,451.75/x
3. Step 3: Cross multiply
   42,438.72x = 63,667.93 × 12,451.75
4. Step 4: Simplify right side
   42,438.72x = 792,777,147.38
5. Step 5: Solve for x
   x = 792,777,147.38/42,438.72
6. Step 6: Final answer
   x = 18,680.52