Finding the Fourth Proportional to 13,105.07, 18,085.07 and 7,136.90

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.07 : 18,085.07 = 7,136.90 : x
2. Step 2: Convert to fraction form
   13,105.07/18,085.07 = 7,136.90/x
3. Step 3: Cross multiply
   13,105.07x = 18,085.07 × 7,136.90
4. Step 4: Simplify right side
   13,105.07x = 129,071,300.40
5. Step 5: Solve for x
   x = 129,071,300.40/13,105.07
6. Step 6: Final answer
   x = 9,848.96