Finding the Fourth Proportional to 2,105.60, 2,902.80 and 1,319.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.60 : 2,902.80 = 1,319.12 : x
2. Step 2: Convert to fraction form
   2,105.60/2,902.80 = 1,319.12/x
3. Step 3: Cross multiply
   2,105.60x = 2,902.80 × 1,319.12
4. Step 4: Simplify right side
   2,105.60x = 3,829,141.54
5. Step 5: Solve for x
   x = 3,829,141.54/2,105.60
6. Step 6: Final answer
   x = 1,818.55