Finding the Fourth Proportional to 6,391.89, 8,820.18 and 3,738.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,391.89 : 8,820.18 = 3,738.78 : x
2. Step 2: Convert to fraction form
   6,391.89/8,820.18 = 3,738.78/x
3. Step 3: Cross multiply
   6,391.89x = 8,820.18 × 3,738.78
4. Step 4: Simplify right side
   6,391.89x = 32,976,712.58
5. Step 5: Solve for x
   x = 32,976,712.58/6,391.89
6. Step 6: Final answer
   x = 5,159.15