Finding the Fourth Proportional to 1,128.56, 1,557.56 and 662.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.56 : 1,557.56 = 662.81 : x
2. Step 2: Convert to fraction form
   1,128.56/1,557.56 = 662.81/x
3. Step 3: Cross multiply
   1,128.56x = 1,557.56 × 662.81
4. Step 4: Simplify right side
   1,128.56x = 1,032,366.92
5. Step 5: Solve for x
   x = 1,032,366.92/1,128.56
6. Step 6: Final answer
   x = 914.76