Finding the Fourth Proportional to 5,020.63, 7,528.23 and 3,987.28

Step by Step Solution

1. Step 1: Write the proportion equation
   5,020.63 : 7,528.23 = 3,987.28 : x
2. Step 2: Convert to fraction form
   5,020.63/7,528.23 = 3,987.28/x
3. Step 3: Cross multiply
   5,020.63x = 7,528.23 × 3,987.28
4. Step 4: Simplify right side
   5,020.63x = 30,017,160.91
5. Step 5: Solve for x
   x = 30,017,160.91/5,020.63
6. Step 6: Final answer
   x = 5,978.76