Finding the Fourth Proportional to 2,669.72, 4,005.12 and 939.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,669.72 : 4,005.12 = 939.56 : x
2. Step 2: Convert to fraction form
   2,669.72/4,005.12 = 939.56/x
3. Step 3: Cross multiply
   2,669.72x = 4,005.12 × 939.56
4. Step 4: Simplify right side
   2,669.72x = 3,763,050.55
5. Step 5: Solve for x
   x = 3,763,050.55/2,669.72
6. Step 6: Final answer
   x = 1,409.53