Finding the Fourth Proportional to 2,826.30, 3,898.35 and 1,988.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,826.30 : 3,898.35 = 1,988.76 : x
2. Step 2: Convert to fraction form
   2,826.30/3,898.35 = 1,988.76/x
3. Step 3: Cross multiply
   2,826.30x = 3,898.35 × 1,988.76
4. Step 4: Simplify right side
   2,826.30x = 7,752,882.55
5. Step 5: Solve for x
   x = 7,752,882.55/2,826.30
6. Step 6: Final answer
   x = 2,743.12