Finding the Fourth Proportional to 2,191.05, 3,287.48 and 1,315.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.05 : 3,287.48 = 1,315.23 : x
2. Step 2: Convert to fraction form
   2,191.05/3,287.48 = 1,315.23/x
3. Step 3: Cross multiply
   2,191.05x = 3,287.48 × 1,315.23
4. Step 4: Simplify right side
   2,191.05x = 4,323,785.74
5. Step 5: Solve for x
   x = 4,323,785.74/2,191.05
6. Step 6: Final answer
   x = 1,973.39