Finding the Fourth Proportional to 2,898.40, 4,329.20 and 2,488.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,898.40 : 4,329.20 = 2,488.72 : x
2. Step 2: Convert to fraction form
   2,898.40/4,329.20 = 2,488.72/x
3. Step 3: Cross multiply
   2,898.40x = 4,329.20 × 2,488.72
4. Step 4: Simplify right side
   2,898.40x = 10,774,166.62
5. Step 5: Solve for x
   x = 10,774,166.62/2,898.40
6. Step 6: Final answer
   x = 3,717.28