Finding the Fourth Proportional to 2,766.15, 4,150.83 and 1,985.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,766.15 : 4,150.83 = 1,985.31 : x
2. Step 2: Convert to fraction form
   2,766.15/4,150.83 = 1,985.31/x
3. Step 3: Cross multiply
   2,766.15x = 4,150.83 × 1,985.31
4. Step 4: Simplify right side
   2,766.15x = 8,240,684.31
5. Step 5: Solve for x
   x = 8,240,684.31/2,766.15
6. Step 6: Final answer
   x = 2,979.12