Finding the Fourth Proportional to 2,188.67, 3,020.40 and 1,304.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.67 : 3,020.40 = 1,304.99 : x
2. Step 2: Convert to fraction form
   2,188.67/3,020.40 = 1,304.99/x
3. Step 3: Cross multiply
   2,188.67x = 3,020.40 × 1,304.99
4. Step 4: Simplify right side
   2,188.67x = 3,941,570.17
5. Step 5: Solve for x
   x = 3,941,570.17/2,188.67
6. Step 6: Final answer
   x = 1,800.90