Finding the Fourth Proportional to 2,638.72, 3,954.84 and 993.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.72 : 3,954.84 = 993.52 : x
2. Step 2: Convert to fraction form
   2,638.72/3,954.84 = 993.52/x
3. Step 3: Cross multiply
   2,638.72x = 3,954.84 × 993.52
4. Step 4: Simplify right side
   2,638.72x = 3,929,212.64
5. Step 5: Solve for x
   x = 3,929,212.64/2,638.72
6. Step 6: Final answer
   x = 1,489.06