Finding the Fourth Proportional to 13,099.74, 18,078.10 and 7,434.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,099.74 : 18,078.10 = 7,434.50 : x
2. Step 2: Convert to fraction form
   13,099.74/18,078.10 = 7,434.50/x
3. Step 3: Cross multiply
   13,099.74x = 18,078.10 × 7,434.50
4. Step 4: Simplify right side
   13,099.74x = 134,401,634.45
5. Step 5: Solve for x
   x = 134,401,634.45/13,099.74
6. Step 6: Final answer
   x = 10,259.87