Finding the Fourth Proportional to 2,840.15, 4,259.58 and 891.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,840.15 : 4,259.58 = 891.89 : x
2. Step 2: Convert to fraction form
   2,840.15/4,259.58 = 891.89/x
3. Step 3: Cross multiply
   2,840.15x = 4,259.58 × 891.89
4. Step 4: Simplify right side
   2,840.15x = 3,799,076.81
5. Step 5: Solve for x
   x = 3,799,076.81/2,840.15
6. Step 6: Final answer
   x = 1,337.63