Finding the Fourth Proportional to 3,935.98, 5,431.90 and 2,167.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,935.98 : 5,431.90 = 2,167.59 : x
2. Step 2: Convert to fraction form
   3,935.98/5,431.90 = 2,167.59/x
3. Step 3: Cross multiply
   3,935.98x = 5,431.90 × 2,167.59
4. Step 4: Simplify right side
   3,935.98x = 11,774,122.86
5. Step 5: Solve for x
   x = 11,774,122.86/3,935.98
6. Step 6: Final answer
   x = 2,991.41