Finding the Fourth Proportional to 2,078.86, 3,118.62 and 617.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.86 : 3,118.62 = 617.86 : x
2. Step 2: Convert to fraction form
   2,078.86/3,118.62 = 617.86/x
3. Step 3: Cross multiply
   2,078.86x = 3,118.62 × 617.86
4. Step 4: Simplify right side
   2,078.86x = 1,926,870.55
5. Step 5: Solve for x
   x = 1,926,870.55/2,078.86
6. Step 6: Final answer
   x = 926.89