Finding the Fourth Proportional to 13,085.96, 18,058.82 and 7,117.74

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.96 : 18,058.82 = 7,117.74 : x
2. Step 2: Convert to fraction form
   13,085.96/18,058.82 = 7,117.74/x
3. Step 3: Cross multiply
   13,085.96x = 18,058.82 × 7,117.74
4. Step 4: Simplify right side
   13,085.96x = 128,537,949.88
5. Step 5: Solve for x
   x = 128,537,949.88/13,085.96
6. Step 6: Final answer
   x = 9,822.59