Finding the Fourth Proportional to 2,191.56, 3,284.74 and 1,265.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.56 : 3,284.74 = 1,265.21 : x
2. Step 2: Convert to fraction form
   2,191.56/3,284.74 = 1,265.21/x
3. Step 3: Cross multiply
   2,191.56x = 3,284.74 × 1,265.21
4. Step 4: Simplify right side
   2,191.56x = 4,155,869.47
5. Step 5: Solve for x
   x = 4,155,869.47/2,191.56
6. Step 6: Final answer
   x = 1,896.31