Finding the Fourth Proportional to 2,772.67, 4,157.86 and 1,128.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,772.67 : 4,157.86 = 1,128.10 : x
2. Step 2: Convert to fraction form
   2,772.67/4,157.86 = 1,128.10/x
3. Step 3: Cross multiply
   2,772.67x = 4,157.86 × 1,128.10
4. Step 4: Simplify right side
   2,772.67x = 4,690,489.44
5. Step 5: Solve for x
   x = 4,690,489.44/2,772.67
6. Step 6: Final answer
   x = 1,691.69