Finding the Fourth Proportional to 13,488.18, 18,609.30 and 7,518.71

Step by Step Solution

1. Step 1: Write the proportion equation
   13,488.18 : 18,609.30 = 7,518.71 : x
2. Step 2: Convert to fraction form
   13,488.18/18,609.30 = 7,518.71/x
3. Step 3: Cross multiply
   13,488.18x = 18,609.30 × 7,518.71
4. Step 4: Simplify right side
   13,488.18x = 139,917,836.96
5. Step 5: Solve for x
   x = 139,917,836.96/13,488.18
6. Step 6: Final answer
   x = 10,373.37