Finding the Fourth Proportional to 3,485.98, 4,811.57 and 2,158.93

Step by Step Solution

1. Step 1: Write the proportion equation
   3,485.98 : 4,811.57 = 2,158.93 : x
2. Step 2: Convert to fraction form
   3,485.98/4,811.57 = 2,158.93/x
3. Step 3: Cross multiply
   3,485.98x = 4,811.57 × 2,158.93
4. Step 4: Simplify right side
   3,485.98x = 10,387,842.82
5. Step 5: Solve for x
   x = 10,387,842.82/3,485.98
6. Step 6: Final answer
   x = 2,979.89