Finding the Fourth Proportional to 13,105.10, 18,085.32 and 7,136.76

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.10 : 18,085.32 = 7,136.76 : x
2. Step 2: Convert to fraction form
   13,105.10/18,085.32 = 7,136.76/x
3. Step 3: Cross multiply
   13,105.10x = 18,085.32 × 7,136.76
4. Step 4: Simplify right side
   13,105.10x = 129,070,642.80
5. Step 5: Solve for x
   x = 129,070,642.80/13,105.10
6. Step 6: Final answer
   x = 9,848.89