Finding the Fourth Proportional to 13,488.06, 18,613.31 and 7,520.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,488.06 : 18,613.31 = 7,520.10 : x
2. Step 2: Convert to fraction form
   13,488.06/18,613.31 = 7,520.10/x
3. Step 3: Cross multiply
   13,488.06x = 18,613.31 × 7,520.10
4. Step 4: Simplify right side
   13,488.06x = 139,973,952.53
5. Step 5: Solve for x
   x = 139,973,952.53/13,488.06
6. Step 6: Final answer
   x = 10,377.62