Finding the Fourth Proportional to 3,485.23, 4,810.56 and 2,158.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,485.23 : 4,810.56 = 2,158.21 : x
2. Step 2: Convert to fraction form
   3,485.23/4,810.56 = 2,158.21/x
3. Step 3: Cross multiply
   3,485.23x = 4,810.56 × 2,158.21
4. Step 4: Simplify right side
   3,485.23x = 10,382,196.62
5. Step 5: Solve for x
   x = 10,382,196.62/3,485.23
6. Step 6: Final answer
   x = 2,978.92