Finding the Fourth Proportional to 6,781.50, 9,358.56 and 3,987

Step by Step Solution

1. Step 1: Write the proportion equation
   6,781.50 : 9,358.56 = 3,987 : x
2. Step 2: Convert to fraction form
   6,781.50/9,358.56 = 3,987/x
3. Step 3: Cross multiply
   6,781.50x = 9,358.56 × 3,987
4. Step 4: Simplify right side
   6,781.50x = 37,312,578.72
5. Step 5: Solve for x
   x = 37,312,578.72/6,781.50
6. Step 6: Final answer
   x = 5,502.11