Finding the Fourth Proportional to 3,987.56, 5,980.50 and 3,789.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.56 : 5,980.50 = 3,789.96 : x
2. Step 2: Convert to fraction form
   3,987.56/5,980.50 = 3,789.96/x
3. Step 3: Cross multiply
   3,987.56x = 5,980.50 × 3,789.96
4. Step 4: Simplify right side
   3,987.56x = 22,665,833.35
5. Step 5: Solve for x
   x = 22,665,833.35/3,987.56
6. Step 6: Final answer
   x = 5,684.13