Finding the Fourth Proportional to 2,646.78, 3,971.68 and 1,002.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,646.78 : 3,971.68 = 1,002.88 : x
2. Step 2: Convert to fraction form
   2,646.78/3,971.68 = 1,002.88/x
3. Step 3: Cross multiply
   2,646.78x = 3,971.68 × 1,002.88
4. Step 4: Simplify right side
   2,646.78x = 3,983,126.54
5. Step 5: Solve for x
   x = 3,983,126.54/2,646.78
6. Step 6: Final answer
   x = 1,504.90