Finding the Fourth Proportional to 3,345.75, 5,018.72 and 880.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,345.75 : 5,018.72 = 880.79 : x
2. Step 2: Convert to fraction form
   3,345.75/5,018.72 = 880.79/x
3. Step 3: Cross multiply
   3,345.75x = 5,018.72 × 880.79
4. Step 4: Simplify right side
   3,345.75x = 4,420,408.89
5. Step 5: Solve for x
   x = 4,420,408.89/3,345.75
6. Step 6: Final answer
   x = 1,321.20