Finding the Fourth Proportional to 13,587, 18,751.20 and 7,538.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,587 : 18,751.20 = 7,538.72 : x
2. Step 2: Convert to fraction form
   13,587/18,751.20 = 7,538.72/x
3. Step 3: Cross multiply
   13,587x = 18,751.20 × 7,538.72
4. Step 4: Simplify right side
   13,587x = 141,360,046.46
5. Step 5: Solve for x
   x = 141,360,046.46/13,587
6. Step 6: Final answer
   x = 10,404.07