Finding the Fourth Proportional to 2,622.91, 3,934.46 and 891.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,622.91 : 3,934.46 = 891.31 : x
2. Step 2: Convert to fraction form
   2,622.91/3,934.46 = 891.31/x
3. Step 3: Cross multiply
   2,622.91x = 3,934.46 × 891.31
4. Step 4: Simplify right side
   2,622.91x = 3,506,823.54
5. Step 5: Solve for x
   x = 3,506,823.54/2,622.91
6. Step 6: Final answer
   x = 1,337.00