Finding the Fourth Proportional to 2,800.01, 4,199.90 and 852.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,800.01 : 4,199.90 = 852.15 : x
2. Step 2: Convert to fraction form
   2,800.01/4,199.90 = 852.15/x
3. Step 3: Cross multiply
   2,800.01x = 4,199.90 × 852.15
4. Step 4: Simplify right side
   2,800.01x = 3,578,940.52
5. Step 5: Solve for x
   x = 3,578,940.52/2,800.01
6. Step 6: Final answer
   x = 1,278.19