Finding the Fourth Proportional to 3,485.40, 4,810.71 and 2,158.32

Step by Step Solution

1. Step 1: Write the proportion equation
   3,485.40 : 4,810.71 = 2,158.32 : x
2. Step 2: Convert to fraction form
   3,485.40/4,810.71 = 2,158.32/x
3. Step 3: Cross multiply
   3,485.40x = 4,810.71 × 2,158.32
4. Step 4: Simplify right side
   3,485.40x = 10,383,051.61
5. Step 5: Solve for x
   x = 10,383,051.61/3,485.40
6. Step 6: Final answer
   x = 2,979.01