Finding the Fourth Proportional to 13,488.69, 18,614.42 and 7,520.74

Step by Step Solution

1. Step 1: Write the proportion equation
   13,488.69 : 18,614.42 = 7,520.74 : x
2. Step 2: Convert to fraction form
   13,488.69/18,614.42 = 7,520.74/x
3. Step 3: Cross multiply
   13,488.69x = 18,614.42 × 7,520.74
4. Step 4: Simplify right side
   13,488.69x = 139,994,226.94
5. Step 5: Solve for x
   x = 139,994,226.94/13,488.69
6. Step 6: Final answer
   x = 10,378.64