Finding the Fourth Proportional to 2,799.80, 4,200.32 and 852.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,799.80 : 4,200.32 = 852.15 : x
2. Step 2: Convert to fraction form
   2,799.80/4,200.32 = 852.15/x
3. Step 3: Cross multiply
   2,799.80x = 4,200.32 × 852.15
4. Step 4: Simplify right side
   2,799.80x = 3,579,298.43
5. Step 5: Solve for x
   x = 3,579,298.43/2,799.80
6. Step 6: Final answer
   x = 1,278.41