Finding the Fourth Proportional to 13,085.12, 18,057.55 and 7,116.83

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.12 : 18,057.55 = 7,116.83 : x
2. Step 2: Convert to fraction form
   13,085.12/18,057.55 = 7,116.83/x
3. Step 3: Cross multiply
   13,085.12x = 18,057.55 × 7,116.83
4. Step 4: Simplify right side
   13,085.12x = 128,512,513.57
5. Step 5: Solve for x
   x = 128,512,513.57/13,085.12
6. Step 6: Final answer
   x = 9,821.27