Finding the Fourth Proportional to 5,672.79, 7,828.89 and 3,155.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,672.79 : 7,828.89 = 3,155.72 : x
2. Step 2: Convert to fraction form
   5,672.79/7,828.89 = 3,155.72/x
3. Step 3: Cross multiply
   5,672.79x = 7,828.89 × 3,155.72
4. Step 4: Simplify right side
   5,672.79x = 24,705,745.61
5. Step 5: Solve for x
   x = 24,705,745.61/5,672.79
6. Step 6: Final answer
   x = 4,355.13