Finding the Fourth Proportional to 1,638.16, 2,438.71 and 1,628.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.16 : 2,438.71 = 1,628.43 : x
2. Step 2: Convert to fraction form
   1,638.16/2,438.71 = 1,628.43/x
3. Step 3: Cross multiply
   1,638.16x = 2,438.71 × 1,628.43
4. Step 4: Simplify right side
   1,638.16x = 3,971,264.45
5. Step 5: Solve for x
   x = 3,971,264.45/1,638.16
6. Step 6: Final answer
   x = 2,424.23