Finding the Fourth Proportional to 2,174.34, 3,000.12 and 1,290.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,174.34 : 3,000.12 = 1,290.42 : x
2. Step 2: Convert to fraction form
   2,174.34/3,000.12 = 1,290.42/x
3. Step 3: Cross multiply
   2,174.34x = 3,000.12 × 1,290.42
4. Step 4: Simplify right side
   2,174.34x = 3,871,414.85
5. Step 5: Solve for x
   x = 3,871,414.85/2,174.34
6. Step 6: Final answer
   x = 1,780.50