Finding the Fourth Proportional to 13,106.58, 18,087.32 and 7,138.27

Step by Step Solution

1. Step 1: Write the proportion equation
   13,106.58 : 18,087.32 = 7,138.27 : x
2. Step 2: Convert to fraction form
   13,106.58/18,087.32 = 7,138.27/x
3. Step 3: Cross multiply
   13,106.58x = 18,087.32 × 7,138.27
4. Step 4: Simplify right side
   13,106.58x = 129,112,173.74
5. Step 5: Solve for x
   x = 129,112,173.74/13,106.58
6. Step 6: Final answer
   x = 9,850.94