Finding the Fourth Proportional to 2,451.58, 3,678.83 and 891.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,451.58 : 3,678.83 = 891.71 : x
2. Step 2: Convert to fraction form
   2,451.58/3,678.83 = 891.71/x
3. Step 3: Cross multiply
   2,451.58x = 3,678.83 × 891.71
4. Step 4: Simplify right side
   2,451.58x = 3,280,449.50
5. Step 5: Solve for x
   x = 3,280,449.50/2,451.58
6. Step 6: Final answer
   x = 1,338.10