Finding the Fourth Proportional to 13,123.55, 18,109.88 and 7,458.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.55 : 18,109.88 = 7,458.15 : x
2. Step 2: Convert to fraction form
   13,123.55/18,109.88 = 7,458.15/x
3. Step 3: Cross multiply
   13,123.55x = 18,109.88 × 7,458.15
4. Step 4: Simplify right side
   13,123.55x = 135,066,164.23
5. Step 5: Solve for x
   x = 135,066,164.23/13,123.55
6. Step 6: Final answer
   x = 10,291.90