Finding the Fourth Proportional to 2,118.82, 3,178.16 and 657.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.82 : 3,178.16 = 657.94 : x
2. Step 2: Convert to fraction form
   2,118.82/3,178.16 = 657.94/x
3. Step 3: Cross multiply
   2,118.82x = 3,178.16 × 657.94
4. Step 4: Simplify right side
   2,118.82x = 2,091,038.59
5. Step 5: Solve for x
   x = 2,091,038.59/2,118.82
6. Step 6: Final answer
   x = 986.89