Finding the Fourth Proportional to 2,638.32, 3,954.45 and 993.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.32 : 3,954.45 = 993.84 : x
2. Step 2: Convert to fraction form
   2,638.32/3,954.45 = 993.84/x
3. Step 3: Cross multiply
   2,638.32x = 3,954.45 × 993.84
4. Step 4: Simplify right side
   2,638.32x = 3,930,090.59
5. Step 5: Solve for x
   x = 3,930,090.59/2,638.32
6. Step 6: Final answer
   x = 1,489.62