Finding the Fourth Proportional to 13,085.48, 18,057.88 and 7,117.04

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.48 : 18,057.88 = 7,117.04 : x
2. Step 2: Convert to fraction form
   13,085.48/18,057.88 = 7,117.04/x
3. Step 3: Cross multiply
   13,085.48x = 18,057.88 × 7,117.04
4. Step 4: Simplify right side
   13,085.48x = 128,518,654.28
5. Step 5: Solve for x
   x = 128,518,654.28/13,085.48
6. Step 6: Final answer
   x = 9,821.47