Finding the Fourth Proportional to 13,508.30, 18,639.57 and 7,538.81

Step by Step Solution

1. Step 1: Write the proportion equation
   13,508.30 : 18,639.57 = 7,538.81 : x
2. Step 2: Convert to fraction form
   13,508.30/18,639.57 = 7,538.81/x
3. Step 3: Cross multiply
   13,508.30x = 18,639.57 × 7,538.81
4. Step 4: Simplify right side
   13,508.30x = 140,520,083.51
5. Step 5: Solve for x
   x = 140,520,083.51/13,508.30
6. Step 6: Final answer
   x = 10,402.50