Finding the Fourth Proportional to 13,286.25, 18,333.42 and 7,620.71

Step by Step Solution

1. Step 1: Write the proportion equation
   13,286.25 : 18,333.42 = 7,620.71 : x
2. Step 2: Convert to fraction form
   13,286.25/18,333.42 = 7,620.71/x
3. Step 3: Cross multiply
   13,286.25x = 18,333.42 × 7,620.71
4. Step 4: Simplify right side
   13,286.25x = 139,713,585.46
5. Step 5: Solve for x
   x = 139,713,585.46/13,286.25
6. Step 6: Final answer
   x = 10,515.65