Finding the Fourth Proportional to 2,153.31, 2,971.49 and 1,315.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.31 : 2,971.49 = 1,315.41 : x
2. Step 2: Convert to fraction form
   2,153.31/2,971.49 = 1,315.41/x
3. Step 3: Cross multiply
   2,153.31x = 2,971.49 × 1,315.41
4. Step 4: Simplify right side
   2,153.31x = 3,908,735.01
5. Step 5: Solve for x
   x = 3,908,735.01/2,153.31
6. Step 6: Final answer
   x = 1,815.22