Finding the Fourth Proportional to 5,178.17, 7,145.86 and 2,820.33

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178.17 : 7,145.86 = 2,820.33 : x
2. Step 2: Convert to fraction form
   5,178.17/7,145.86 = 2,820.33/x
3. Step 3: Cross multiply
   5,178.17x = 7,145.86 × 2,820.33
4. Step 4: Simplify right side
   5,178.17x = 20,153,683.33
5. Step 5: Solve for x
   x = 20,153,683.33/5,178.17
6. Step 6: Final answer
   x = 3,892.05