Finding the Fourth Proportional to 7,201.86, 10,802.43 and 2,820.12

Step by Step Solution

1. Step 1: Write the proportion equation
   7,201.86 : 10,802.43 = 2,820.12 : x
2. Step 2: Convert to fraction form
   7,201.86/10,802.43 = 2,820.12/x
3. Step 3: Cross multiply
   7,201.86x = 10,802.43 × 2,820.12
4. Step 4: Simplify right side
   7,201.86x = 30,464,148.89
5. Step 5: Solve for x
   x = 30,464,148.89/7,201.86
6. Step 6: Final answer
   x = 4,230.04