Finding the Fourth Proportional to 12,669.72, 19,003.68 and 3,903.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,669.72 : 19,003.68 = 3,903.72 : x
2. Step 2: Convert to fraction form
   12,669.72/19,003.68 = 3,903.72/x
3. Step 3: Cross multiply
   12,669.72x = 19,003.68 × 3,903.72
4. Step 4: Simplify right side
   12,669.72x = 74,185,045.69
5. Step 5: Solve for x
   x = 74,185,045.69/12,669.72
6. Step 6: Final answer
   x = 5,855.30