Finding the Fourth Proportional to 1,638.98, 2,456.90 and 1,052.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.98 : 2,456.90 = 1,052.34 : x
2. Step 2: Convert to fraction form
   1,638.98/2,456.90 = 1,052.34/x
3. Step 3: Cross multiply
   1,638.98x = 2,456.90 × 1,052.34
4. Step 4: Simplify right side
   1,638.98x = 2,585,494.15
5. Step 5: Solve for x
   x = 2,585,494.15/1,638.98
6. Step 6: Final answer
   x = 1,577.50