Finding the Fourth Proportional to 5,591.38, 7,719.16 and 3,917.92

Step by Step Solution

1. Step 1: Write the proportion equation
   5,591.38 : 7,719.16 = 3,917.92 : x
2. Step 2: Convert to fraction form
   5,591.38/7,719.16 = 3,917.92/x
3. Step 3: Cross multiply
   5,591.38x = 7,719.16 × 3,917.92
4. Step 4: Simplify right side
   5,591.38x = 30,243,051.35
5. Step 5: Solve for x
   x = 30,243,051.35/5,591.38
6. Step 6: Final answer
   x = 5,408.87