Finding the Fourth Proportional to 1,638.52, 2,458.12 and 906.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.52 : 2,458.12 = 906.55 : x
2. Step 2: Convert to fraction form
   1,638.52/2,458.12 = 906.55/x
3. Step 3: Cross multiply
   1,638.52x = 2,458.12 × 906.55
4. Step 4: Simplify right side
   1,638.52x = 2,228,408.69
5. Step 5: Solve for x
   x = 2,228,408.69/1,638.52
6. Step 6: Final answer
   x = 1,360.01