Finding the Fourth Proportional to 12,638.16, 18,951 and 3,870.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,638.16 : 18,951 = 3,870.96 : x
2. Step 2: Convert to fraction form
   12,638.16/18,951 = 3,870.96/x
3. Step 3: Cross multiply
   12,638.16x = 18,951 × 3,870.96
4. Step 4: Simplify right side
   12,638.16x = 73,358,562.96
5. Step 5: Solve for x
   x = 73,358,562.96/12,638.16
6. Step 6: Final answer
   x = 5,804.53