Finding the Fourth Proportional to 12,638.76, 18,958.12 and 3,872.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,638.76 : 18,958.12 = 3,872.52 : x
2. Step 2: Convert to fraction form
   12,638.76/18,958.12 = 3,872.52/x
3. Step 3: Cross multiply
   12,638.76x = 18,958.12 × 3,872.52
4. Step 4: Simplify right side
   12,638.76x = 73,415,698.86
5. Step 5: Solve for x
   x = 73,415,698.86/12,638.76
6. Step 6: Final answer
   x = 5,808.77