Finding the Fourth Proportional to 2,851.76, 4,279.80 and 1,391.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,851.76 : 4,279.80 = 1,391.84 : x
2. Step 2: Convert to fraction form
   2,851.76/4,279.80 = 1,391.84/x
3. Step 3: Cross multiply
   2,851.76x = 4,279.80 × 1,391.84
4. Step 4: Simplify right side
   2,851.76x = 5,956,796.83
5. Step 5: Solve for x
   x = 5,956,796.83/2,851.76
6. Step 6: Final answer
   x = 2,088.81