Finding the Fourth Proportional to 13,106.16, 18,086.61 and 7,137.87

Step by Step Solution

1. Step 1: Write the proportion equation
   13,106.16 : 18,086.61 = 7,137.87 : x
2. Step 2: Convert to fraction form
   13,106.16/18,086.61 = 7,137.87/x
3. Step 3: Cross multiply
   13,106.16x = 18,086.61 × 7,137.87
4. Step 4: Simplify right side
   13,106.16x = 129,099,870.92
5. Step 5: Solve for x
   x = 129,099,870.92/13,106.16
6. Step 6: Final answer
   x = 9,850.32