Finding the Fourth Proportional to 13,085.68, 18,058.37 and 7,117.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.68 : 18,058.37 = 7,117.49 : x
2. Step 2: Convert to fraction form
   13,085.68/18,058.37 = 7,117.49/x
3. Step 3: Cross multiply
   13,085.68x = 18,058.37 × 7,117.49
4. Step 4: Simplify right side
   13,085.68x = 128,530,267.89
5. Step 5: Solve for x
   x = 128,530,267.89/13,085.68
6. Step 6: Final answer
   x = 9,822.21