Finding the Fourth Proportional to 2,153.89, 2,972.58 and 1,315.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.89 : 2,972.58 = 1,315.15 : x
2. Step 2: Convert to fraction form
   2,153.89/2,972.58 = 1,315.15/x
3. Step 3: Cross multiply
   2,153.89x = 2,972.58 × 1,315.15
4. Step 4: Simplify right side
   2,153.89x = 3,909,388.59
5. Step 5: Solve for x
   x = 3,909,388.59/2,153.89
6. Step 6: Final answer
   x = 1,815.04