Finding the Fourth Proportional to 2,105.60, 3,158.80 and 1,011.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.60 : 3,158.80 = 1,011.29 : x
2. Step 2: Convert to fraction form
   2,105.60/3,158.80 = 1,011.29/x
3. Step 3: Cross multiply
   2,105.60x = 3,158.80 × 1,011.29
4. Step 4: Simplify right side
   2,105.60x = 3,194,444.53
5. Step 5: Solve for x
   x = 3,194,444.53/2,105.60
6. Step 6: Final answer
   x = 1,517.12