Finding the Fourth Proportional to 6,615.15, 9,128.31 and 3,781.98

Step by Step Solution

1. Step 1: Write the proportion equation
   6,615.15 : 9,128.31 = 3,781.98 : x
2. Step 2: Convert to fraction form
   6,615.15/9,128.31 = 3,781.98/x
3. Step 3: Cross multiply
   6,615.15x = 9,128.31 × 3,781.98
4. Step 4: Simplify right side
   6,615.15x = 34,523,085.85
5. Step 5: Solve for x
   x = 34,523,085.85/6,615.15
6. Step 6: Final answer
   x = 5,218.79