Finding the Fourth Proportional to 2,827.30, 3,899.72 and 1,989.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,827.30 : 3,899.72 = 1,989.76 : x
2. Step 2: Convert to fraction form
   2,827.30/3,899.72 = 1,989.76/x
3. Step 3: Cross multiply
   2,827.30x = 3,899.72 × 1,989.76
4. Step 4: Simplify right side
   2,827.30x = 7,759,506.87
5. Step 5: Solve for x
   x = 7,759,506.87/2,827.30
6. Step 6: Final answer
   x = 2,744.49