Finding the Fourth Proportional to 2,105.39, 3,156.57 and 1,315.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.39 : 3,156.57 = 1,315.04 : x
2. Step 2: Convert to fraction form
   2,105.39/3,156.57 = 1,315.04/x
3. Step 3: Cross multiply
   2,105.39x = 3,156.57 × 1,315.04
4. Step 4: Simplify right side
   2,105.39x = 4,151,000.03
5. Step 5: Solve for x
   x = 4,151,000.03/2,105.39
6. Step 6: Final answer
   x = 1,971.60