Finding the Fourth Proportional to 13,123.60, 18,106.50 and 7,458.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.60 : 18,106.50 = 7,458.10 : x
2. Step 2: Convert to fraction form
   13,123.60/18,106.50 = 7,458.10/x
3. Step 3: Cross multiply
   13,123.60x = 18,106.50 × 7,458.10
4. Step 4: Simplify right side
   13,123.60x = 135,040,087.65
5. Step 5: Solve for x
   x = 135,040,087.65/13,123.60
6. Step 6: Final answer
   x = 10,289.87