Finding the Fourth Proportional to 2,188.90, 3,020.69 and 1,304.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.90 : 3,020.69 = 1,304.72 : x
2. Step 2: Convert to fraction form
   2,188.90/3,020.69 = 1,304.72/x
3. Step 3: Cross multiply
   2,188.90x = 3,020.69 × 1,304.72
4. Step 4: Simplify right side
   2,188.90x = 3,941,154.66
5. Step 5: Solve for x
   x = 3,941,154.66/2,188.90
6. Step 6: Final answer
   x = 1,800.52