Finding the Fourth Proportional to 3,315.76, 4,974.98 and 2,131.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,315.76 : 4,974.98 = 2,131.12 : x
2. Step 2: Convert to fraction form
   3,315.76/4,974.98 = 2,131.12/x
3. Step 3: Cross multiply
   3,315.76x = 4,974.98 × 2,131.12
4. Step 4: Simplify right side
   3,315.76x = 10,602,279.38
5. Step 5: Solve for x
   x = 10,602,279.38/3,315.76
6. Step 6: Final answer
   x = 3,197.55