Finding the Fourth Proportional to 13,287.55, 18,337.61 and 7,622.26

Step by Step Solution

1. Step 1: Write the proportion equation
   13,287.55 : 18,337.61 = 7,622.26 : x
2. Step 2: Convert to fraction form
   13,287.55/18,337.61 = 7,622.26/x
3. Step 3: Cross multiply
   13,287.55x = 18,337.61 × 7,622.26
4. Step 4: Simplify right side
   13,287.55x = 139,773,975.83
5. Step 5: Solve for x
   x = 139,773,975.83/13,287.55
6. Step 6: Final answer
   x = 10,519.17