Finding the Fourth Proportional to 2,987.47, 4,488.53 and 2,821.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,987.47 : 4,488.53 = 2,821.69 : x
2. Step 2: Convert to fraction form
   2,987.47/4,488.53 = 2,821.69/x
3. Step 3: Cross multiply
   2,987.47x = 4,488.53 × 2,821.69
4. Step 4: Simplify right side
   2,987.47x = 12,665,240.22
5. Step 5: Solve for x
   x = 12,665,240.22/2,987.47
6. Step 6: Final answer
   x = 4,239.45