Finding the Fourth Proportional to 1,455.77, 2,010.59 and 1,128.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,455.77 : 2,010.59 = 1,128.15 : x
2. Step 2: Convert to fraction form
   1,455.77/2,010.59 = 1,128.15/x
3. Step 3: Cross multiply
   1,455.77x = 2,010.59 × 1,128.15
4. Step 4: Simplify right side
   1,455.77x = 2,268,241.47
5. Step 5: Solve for x
   x = 2,268,241.47/1,455.77
6. Step 6: Final answer
   x = 1,558.11