Finding the Fourth Proportional to 2,174.72, 3,000 and 1,290.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,174.72 : 3,000 = 1,290.16 : x
2. Step 2: Convert to fraction form
   2,174.72/3,000 = 1,290.16/x
3. Step 3: Cross multiply
   2,174.72x = 3,000 × 1,290.16
4. Step 4: Simplify right side
   2,174.72x = 3,870,480.00
5. Step 5: Solve for x
   x = 3,870,480.00/2,174.72
6. Step 6: Final answer
   x = 1,779.76