Finding the Fourth Proportional to 13,085.10, 18,057.30 and 7,116.82

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.10 : 18,057.30 = 7,116.82 : x
2. Step 2: Convert to fraction form
   13,085.10/18,057.30 = 7,116.82/x
3. Step 3: Cross multiply
   13,085.10x = 18,057.30 × 7,116.82
4. Step 4: Simplify right side
   13,085.10x = 128,510,553.79
5. Step 5: Solve for x
   x = 128,510,553.79/13,085.10
6. Step 6: Final answer
   x = 9,821.14