Finding the Fourth Proportional to 13,085.37, 18,057.90 and 7,117.08

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.37 : 18,057.90 = 7,117.08 : x
2. Step 2: Convert to fraction form
   13,085.37/18,057.90 = 7,117.08/x
3. Step 3: Cross multiply
   13,085.37x = 18,057.90 × 7,117.08
4. Step 4: Simplify right side
   13,085.37x = 128,519,483.35
5. Step 5: Solve for x
   x = 128,519,483.35/13,085.37
6. Step 6: Final answer
   x = 9,821.62