Finding the Fourth Proportional to 2,879.86, 3,965.88 and 1,994.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,879.86 : 3,965.88 = 1,994.12 : x
2. Step 2: Convert to fraction form
   2,879.86/3,965.88 = 1,994.12/x
3. Step 3: Cross multiply
   2,879.86x = 3,965.88 × 1,994.12
4. Step 4: Simplify right side
   2,879.86x = 7,908,440.63
5. Step 5: Solve for x
   x = 7,908,440.63/2,879.86
6. Step 6: Final answer
   x = 2,746.12