Finding the Fourth Proportional to 2,773.58, 4,158.80 and 1,128.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,773.58 : 4,158.80 = 1,128.20 : x
2. Step 2: Convert to fraction form
   2,773.58/4,158.80 = 1,128.20/x
3. Step 3: Cross multiply
   2,773.58x = 4,158.80 × 1,128.20
4. Step 4: Simplify right side
   2,773.58x = 4,691,931.73
5. Step 5: Solve for x
   x = 4,691,931.73/2,773.58
6. Step 6: Final answer
   x = 1,691.65