Finding the Fourth Proportional to 12,761.76, 17,611.04 and 7,172.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,761.76 : 17,611.04 = 7,172.72 : x
2. Step 2: Convert to fraction form
   12,761.76/17,611.04 = 7,172.72/x
3. Step 3: Cross multiply
   12,761.76x = 17,611.04 × 7,172.72
4. Step 4: Simplify right side
   12,761.76x = 126,319,058.83
5. Step 5: Solve for x
   x = 126,319,058.83/12,761.76
6. Step 6: Final answer
   x = 9,898.25