Finding the Fourth Proportional to 2,438.21, 3,654.19 and 1,398.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,438.21 : 3,654.19 = 1,398.78 : x
2. Step 2: Convert to fraction form
   2,438.21/3,654.19 = 1,398.78/x
3. Step 3: Cross multiply
   2,438.21x = 3,654.19 × 1,398.78
4. Step 4: Simplify right side
   2,438.21x = 5,111,407.89
5. Step 5: Solve for x
   x = 5,111,407.89/2,438.21
6. Step 6: Final answer
   x = 2,096.38