Finding the Fourth Proportional to 5,178.89, 7,146.86 and 2,821.02

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178.89 : 7,146.86 = 2,821.02 : x
2. Step 2: Convert to fraction form
   5,178.89/7,146.86 = 2,821.02/x
3. Step 3: Cross multiply
   5,178.89x = 7,146.86 × 2,821.02
4. Step 4: Simplify right side
   5,178.89x = 20,161,435.00
5. Step 5: Solve for x
   x = 20,161,435.00/5,178.89
6. Step 6: Final answer
   x = 3,893.00