Finding the Fourth Proportional to 3,935.89, 5,431.50 and 2,167.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,935.89 : 5,431.50 = 2,167.57 : x
2. Step 2: Convert to fraction form
   3,935.89/5,431.50 = 2,167.57/x
3. Step 3: Cross multiply
   3,935.89x = 5,431.50 × 2,167.57
4. Step 4: Simplify right side
   3,935.89x = 11,773,156.46
5. Step 5: Solve for x
   x = 11,773,156.46/3,935.89
6. Step 6: Final answer
   x = 2,991.23