Finding the Fourth Proportional to 2,839.63, 4,259.85 and 891.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,839.63 : 4,259.85 = 891.31 : x
2. Step 2: Convert to fraction form
   2,839.63/4,259.85 = 891.31/x
3. Step 3: Cross multiply
   2,839.63x = 4,259.85 × 891.31
4. Step 4: Simplify right side
   2,839.63x = 3,796,846.90
5. Step 5: Solve for x
   x = 3,796,846.90/2,839.63
6. Step 6: Final answer
   x = 1,337.09