Finding the Fourth Proportional to 2,986.47, 4,487.03 and 2,820.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,986.47 : 4,487.03 = 2,820.69 : x
2. Step 2: Convert to fraction form
   2,986.47/4,487.03 = 2,820.69/x
3. Step 3: Cross multiply
   2,986.47x = 4,487.03 × 2,820.69
4. Step 4: Simplify right side
   2,986.47x = 12,656,506.55
5. Step 5: Solve for x
   x = 12,656,506.55/2,986.47
6. Step 6: Final answer
   x = 4,237.95