Finding the Fourth Proportional to 3,994.08, 5,499.94 and 3,905.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,994.08 : 5,499.94 = 3,905.57 : x
2. Step 2: Convert to fraction form
   3,994.08/5,499.94 = 3,905.57/x
3. Step 3: Cross multiply
   3,994.08x = 5,499.94 × 3,905.57
4. Step 4: Simplify right side
   3,994.08x = 21,480,400.67
5. Step 5: Solve for x
   x = 21,480,400.67/3,994.08
6. Step 6: Final answer
   x = 5,378.06