Finding the Fourth Proportional to 8,085.12, 12,130.73 and 2,820.53

Step by Step Solution

1. Step 1: Write the proportion equation
   8,085.12 : 12,130.73 = 2,820.53 : x
2. Step 2: Convert to fraction form
   8,085.12/12,130.73 = 2,820.53/x
3. Step 3: Cross multiply
   8,085.12x = 12,130.73 × 2,820.53
4. Step 4: Simplify right side
   8,085.12x = 34,215,013.13
5. Step 5: Solve for x
   x = 34,215,013.13/8,085.12
6. Step 6: Final answer
   x = 4,231.85