Finding the Fourth Proportional to 2,157.89, 2,977.91 and 1,226.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.89 : 2,977.91 = 1,226.39 : x
2. Step 2: Convert to fraction form
   2,157.89/2,977.91 = 1,226.39/x
3. Step 3: Cross multiply
   2,157.89x = 2,977.91 × 1,226.39
4. Step 4: Simplify right side
   2,157.89x = 3,652,086.27
5. Step 5: Solve for x
   x = 3,652,086.27/2,157.89
6. Step 6: Final answer
   x = 1,692.43