Finding the Fourth Proportional to 2,839.72, 4,260.30 and 891.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,839.72 : 4,260.30 = 891.96 : x
2. Step 2: Convert to fraction form
   2,839.72/4,260.30 = 891.96/x
3. Step 3: Cross multiply
   2,839.72x = 4,260.30 × 891.96
4. Step 4: Simplify right side
   2,839.72x = 3,800,017.19
5. Step 5: Solve for x
   x = 3,800,017.19/2,839.72
6. Step 6: Final answer
   x = 1,338.17