Finding the Fourth Proportional to 6,820.61, 10,235.77 and 3,120.53

Step by Step Solution

1. Step 1: Write the proportion equation
   6,820.61 : 10,235.77 = 3,120.53 : x
2. Step 2: Convert to fraction form
   6,820.61/10,235.77 = 3,120.53/x
3. Step 3: Cross multiply
   6,820.61x = 10,235.77 × 3,120.53
4. Step 4: Simplify right side
   6,820.61x = 31,940,968.38
5. Step 5: Solve for x
   x = 31,940,968.38/6,820.61
6. Step 6: Final answer
   x = 4,683.01