Finding the Fourth Proportional to 13,219.50, 18,242.91 and 7,630.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,219.50 : 18,242.91 = 7,630.50 : x
2. Step 2: Convert to fraction form
   13,219.50/18,242.91 = 7,630.50/x
3. Step 3: Cross multiply
   13,219.50x = 18,242.91 × 7,630.50
4. Step 4: Simplify right side
   13,219.50x = 139,202,524.76
5. Step 5: Solve for x
   x = 139,202,524.76/13,219.50
6. Step 6: Final answer
   x = 10,530.09