Finding the Fourth Proportional to 1,208.56, 1,667.80 and 656.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.56 : 1,667.80 = 656.56 : x
2. Step 2: Convert to fraction form
   1,208.56/1,667.80 = 656.56/x
3. Step 3: Cross multiply
   1,208.56x = 1,667.80 × 656.56
4. Step 4: Simplify right side
   1,208.56x = 1,095,010.77
5. Step 5: Solve for x
   x = 1,095,010.77/1,208.56
6. Step 6: Final answer
   x = 906.05