Finding the Fourth Proportional to 13,488.31, 18,613.15 and 7,518.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,488.31 : 18,613.15 = 7,518.91 : x
2. Step 2: Convert to fraction form
   13,488.31/18,613.15 = 7,518.91/x
3. Step 3: Cross multiply
   13,488.31x = 18,613.15 × 7,518.91
4. Step 4: Simplify right side
   13,488.31x = 139,950,599.67
5. Step 5: Solve for x
   x = 139,950,599.67/13,488.31
6. Step 6: Final answer
   x = 10,375.70