Finding the Fourth Proportional to 13,085.36, 18,058.54 and 7,116.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.36 : 18,058.54 = 7,116.91 : x
2. Step 2: Convert to fraction form
   13,085.36/18,058.54 = 7,116.91/x
3. Step 3: Cross multiply
   13,085.36x = 18,058.54 × 7,116.91
4. Step 4: Simplify right side
   13,085.36x = 128,521,003.91
5. Step 5: Solve for x
   x = 128,521,003.91/13,085.36
6. Step 6: Final answer
   x = 9,821.74