Finding the Fourth Proportional to 2,097.15, 3,145.11 and 636.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,097.15 : 3,145.11 = 636.72 : x
2. Step 2: Convert to fraction form
   2,097.15/3,145.11 = 636.72/x
3. Step 3: Cross multiply
   2,097.15x = 3,145.11 × 636.72
4. Step 4: Simplify right side
   2,097.15x = 2,002,554.44
5. Step 5: Solve for x
   x = 2,002,554.44/2,097.15
6. Step 6: Final answer
   x = 954.89