Finding the Fourth Proportional to 2,117.57, 3,176.42 and 656.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.57 : 3,176.42 = 656.73 : x
2. Step 2: Convert to fraction form
   2,117.57/3,176.42 = 656.73/x
3. Step 3: Cross multiply
   2,117.57x = 3,176.42 × 656.73
4. Step 4: Simplify right side
   2,117.57x = 2,086,050.31
5. Step 5: Solve for x
   x = 2,086,050.31/2,117.57
6. Step 6: Final answer
   x = 985.12