Finding the Fourth Proportional to 2,105.79, 3,158.68 and 1,130.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.79 : 3,158.68 = 1,130.55 : x
2. Step 2: Convert to fraction form
   2,105.79/3,158.68 = 1,130.55/x
3. Step 3: Cross multiply
   2,105.79x = 3,158.68 × 1,130.55
4. Step 4: Simplify right side
   2,105.79x = 3,571,045.67
5. Step 5: Solve for x
   x = 3,571,045.67/2,105.79
6. Step 6: Final answer
   x = 1,695.82