Finding the Fourth Proportional to 12,080.82, 18,120.42 and 3,315

Step by Step Solution

1. Step 1: Write the proportion equation
   12,080.82 : 18,120.42 = 3,315 : x
2. Step 2: Convert to fraction form
   12,080.82/18,120.42 = 3,315/x
3. Step 3: Cross multiply
   12,080.82x = 18,120.42 × 3,315
4. Step 4: Simplify right side
   12,080.82x = 60,069,192.30
5. Step 5: Solve for x
   x = 60,069,192.30/12,080.82
6. Step 6: Final answer
   x = 4,972.28