Finding the Fourth Proportional to 2,174.68, 3,000.84 and 1,290.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,174.68 : 3,000.84 = 1,290.34 : x
2. Step 2: Convert to fraction form
   2,174.68/3,000.84 = 1,290.34/x
3. Step 3: Cross multiply
   2,174.68x = 3,000.84 × 1,290.34
4. Step 4: Simplify right side
   2,174.68x = 3,872,103.89
5. Step 5: Solve for x
   x = 3,872,103.89/2,174.68
6. Step 6: Final answer
   x = 1,780.54