Finding the Fourth Proportional to 2,191.78, 3,284.84 and 891.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.78 : 3,284.84 = 891.74 : x
2. Step 2: Convert to fraction form
   2,191.78/3,284.84 = 891.74/x
3. Step 3: Cross multiply
   2,191.78x = 3,284.84 × 891.74
4. Step 4: Simplify right side
   2,191.78x = 2,929,223.22
5. Step 5: Solve for x
   x = 2,929,223.22/2,191.78
6. Step 6: Final answer
   x = 1,336.46