Finding the Fourth Proportional to 13,508.72, 18,641.99 and 7,540.32

Step by Step Solution

1. Step 1: Write the proportion equation
   13,508.72 : 18,641.99 = 7,540.32 : x
2. Step 2: Convert to fraction form
   13,508.72/18,641.99 = 7,540.32/x
3. Step 3: Cross multiply
   13,508.72x = 18,641.99 × 7,540.32
4. Step 4: Simplify right side
   13,508.72x = 140,566,532.34
5. Step 5: Solve for x
   x = 140,566,532.34/13,508.72
6. Step 6: Final answer
   x = 10,405.62