Finding the Fourth Proportional to 1,638.50, 2,458.69 and 651.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.50 : 2,458.69 = 651.38 : x
2. Step 2: Convert to fraction form
   1,638.50/2,458.69 = 651.38/x
3. Step 3: Cross multiply
   1,638.50x = 2,458.69 × 651.38
4. Step 4: Simplify right side
   1,638.50x = 1,601,527.57
5. Step 5: Solve for x
   x = 1,601,527.57/1,638.50
6. Step 6: Final answer
   x = 977.44