Finding the Fourth Proportional to 2,118.56, 3,176.82 and 657.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.56 : 3,176.82 = 657.72 : x
2. Step 2: Convert to fraction form
   2,118.56/3,176.82 = 657.72/x
3. Step 3: Cross multiply
   2,118.56x = 3,176.82 × 657.72
4. Step 4: Simplify right side
   2,118.56x = 2,089,458.05
5. Step 5: Solve for x
   x = 2,089,458.05/2,118.56
6. Step 6: Final answer
   x = 986.27