Finding the Fourth Proportional to 1,116.44, 1,662.86 and 1,057.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.44 : 1,662.86 = 1,057.89 : x
2. Step 2: Convert to fraction form
   1,116.44/1,662.86 = 1,057.89/x
3. Step 3: Cross multiply
   1,116.44x = 1,662.86 × 1,057.89
4. Step 4: Simplify right side
   1,116.44x = 1,759,122.97
5. Step 5: Solve for x
   x = 1,759,122.97/1,116.44
6. Step 6: Final answer
   x = 1,575.65