Finding the Fourth Proportional to 3,320.22, 4,980.88 and 1,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,320.22 : 4,980.88 = 1,128.72 : x
2. Step 2: Convert to fraction form
   3,320.22/4,980.88 = 1,128.72/x
3. Step 3: Cross multiply
   3,320.22x = 4,980.88 × 1,128.72
4. Step 4: Simplify right side
   3,320.22x = 5,622,018.87
5. Step 5: Solve for x
   x = 5,622,018.87/3,320.22
6. Step 6: Final answer
   x = 1,693.27