Finding the Fourth Proportional to 13,105.86, 18,085.50 and 7,137.17

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.86 : 18,085.50 = 7,137.17 : x
2. Step 2: Convert to fraction form
   13,105.86/18,085.50 = 7,137.17/x
3. Step 3: Cross multiply
   13,105.86x = 18,085.50 × 7,137.17
4. Step 4: Simplify right side
   13,105.86x = 129,079,197.61
5. Step 5: Solve for x
   x = 129,079,197.61/13,105.86
6. Step 6: Final answer
   x = 9,848.97