Finding the Fourth Proportional to 3,864.86, 5,799.12 and 1,399.02

Step by Step Solution

1. Step 1: Write the proportion equation
   3,864.86 : 5,799.12 = 1,399.02 : x
2. Step 2: Convert to fraction form
   3,864.86/5,799.12 = 1,399.02/x
3. Step 3: Cross multiply
   3,864.86x = 5,799.12 × 1,399.02
4. Step 4: Simplify right side
   3,864.86x = 8,113,084.86
5. Step 5: Solve for x
   x = 8,113,084.86/3,864.86
6. Step 6: Final answer
   x = 2,099.19