Finding the Fourth Proportional to 1,128.89, 1,557.82 and 656.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.89 : 1,557.82 = 656.72 : x
2. Step 2: Convert to fraction form
   1,128.89/1,557.82 = 656.72/x
3. Step 3: Cross multiply
   1,128.89x = 1,557.82 × 656.72
4. Step 4: Simplify right side
   1,128.89x = 1,023,051.55
5. Step 5: Solve for x
   x = 1,023,051.55/1,128.89
6. Step 6: Final answer
   x = 906.25