Finding the Fourth Proportional to 3,528.55, 4,869.81 and 2,112.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,528.55 : 4,869.81 = 2,112.21 : x
2. Step 2: Convert to fraction form
   3,528.55/4,869.81 = 2,112.21/x
3. Step 3: Cross multiply
   3,528.55x = 4,869.81 × 2,112.21
4. Step 4: Simplify right side
   3,528.55x = 10,286,061.38
5. Step 5: Solve for x
   x = 10,286,061.38/3,528.55
6. Step 6: Final answer
   x = 2,915.10