Finding the Fourth Proportional to 13,106.71, 18,087.78 and 7,518.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,106.71 : 18,087.78 = 7,518.79 : x
2. Step 2: Convert to fraction form
   13,106.71/18,087.78 = 7,518.79/x
3. Step 3: Cross multiply
   13,106.71x = 18,087.78 × 7,518.79
4. Step 4: Simplify right side
   13,106.71x = 135,998,219.39
5. Step 5: Solve for x
   x = 135,998,219.39/13,106.71
6. Step 6: Final answer
   x = 10,376.23