Finding the Fourth Proportional to 1,128.94, 1,557.87 and 656.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.94 : 1,557.87 = 656.76 : x
2. Step 2: Convert to fraction form
   1,128.94/1,557.87 = 656.76/x
3. Step 3: Cross multiply
   1,128.94x = 1,557.87 × 656.76
4. Step 4: Simplify right side
   1,128.94x = 1,023,141.32
5. Step 5: Solve for x
   x = 1,023,141.32/1,128.94
6. Step 6: Final answer
   x = 906.29