Finding the Fourth Proportional to 2,799.60, 4,196.16 and 1,239.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,799.60 : 4,196.16 = 1,239.12 : x
2. Step 2: Convert to fraction form
   2,799.60/4,196.16 = 1,239.12/x
3. Step 3: Cross multiply
   2,799.60x = 4,196.16 × 1,239.12
4. Step 4: Simplify right side
   2,799.60x = 5,199,545.78
5. Step 5: Solve for x
   x = 5,199,545.78/2,799.60
6. Step 6: Final answer
   x = 1,857.25