Finding the Fourth Proportional to 3,684.99, 5,084.72 and 2,112.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,684.99 : 5,084.72 = 2,112.78 : x
2. Step 2: Convert to fraction form
   3,684.99/5,084.72 = 2,112.78/x
3. Step 3: Cross multiply
   3,684.99x = 5,084.72 × 2,112.78
4. Step 4: Simplify right side
   3,684.99x = 10,742,884.16
5. Step 5: Solve for x
   x = 10,742,884.16/3,684.99
6. Step 6: Final answer
   x = 2,915.31