Finding the Fourth Proportional to 2,667.28, 3,680.22 and 1,869.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,667.28 : 3,680.22 = 1,869.60 : x
2. Step 2: Convert to fraction form
   2,667.28/3,680.22 = 1,869.60/x
3. Step 3: Cross multiply
   2,667.28x = 3,680.22 × 1,869.60
4. Step 4: Simplify right side
   2,667.28x = 6,880,539.31
5. Step 5: Solve for x
   x = 6,880,539.31/2,667.28
6. Step 6: Final answer
   x = 2,579.61