Finding the Fourth Proportional to 2,617.86, 3,927 and 886.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.86 : 3,927 = 886.50 : x
2. Step 2: Convert to fraction form
   2,617.86/3,927 = 886.50/x
3. Step 3: Cross multiply
   2,617.86x = 3,927 × 886.50
4. Step 4: Simplify right side
   2,617.86x = 3,481,285.50
5. Step 5: Solve for x
   x = 3,481,285.50/2,617.86
6. Step 6: Final answer
   x = 1,329.82