Finding the Fourth Proportional to 13,105.61, 18,085.16 and 7,136.92

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.61 : 18,085.16 = 7,136.92 : x
2. Step 2: Convert to fraction form
   13,105.61/18,085.16 = 7,136.92/x
3. Step 3: Cross multiply
   13,105.61x = 18,085.16 × 7,136.92
4. Step 4: Simplify right side
   13,105.61x = 129,072,214.00
5. Step 5: Solve for x
   x = 129,072,214.00/13,105.61
6. Step 6: Final answer
   x = 9,848.63