Finding the Fourth Proportional to 1,128.34, 1,557.15 and 656.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.34 : 1,557.15 = 656.23 : x
2. Step 2: Convert to fraction form
   1,128.34/1,557.15 = 656.23/x
3. Step 3: Cross multiply
   1,128.34x = 1,557.15 × 656.23
4. Step 4: Simplify right side
   1,128.34x = 1,021,848.54
5. Step 5: Solve for x
   x = 1,021,848.54/1,128.34
6. Step 6: Final answer
   x = 905.62