Finding the Fourth Proportional to 13,488.36, 18,613.86 and 7,520.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,488.36 : 18,613.86 = 7,520.10 : x
2. Step 2: Convert to fraction form
   13,488.36/18,613.86 = 7,520.10/x
3. Step 3: Cross multiply
   13,488.36x = 18,613.86 × 7,520.10
4. Step 4: Simplify right side
   13,488.36x = 139,978,088.59
5. Step 5: Solve for x
   x = 139,978,088.59/13,488.36
6. Step 6: Final answer
   x = 10,377.70