Finding the Fourth Proportional to 2,188.40, 3,279.56 and 1,353.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.40 : 3,279.56 = 1,353.69 : x
2. Step 2: Convert to fraction form
   2,188.40/3,279.56 = 1,353.69/x
3. Step 3: Cross multiply
   2,188.40x = 3,279.56 × 1,353.69
4. Step 4: Simplify right side
   2,188.40x = 4,439,500.81
5. Step 5: Solve for x
   x = 4,439,500.81/2,188.40
6. Step 6: Final answer
   x = 2,028.66