Finding the Fourth Proportional to 13,275.76, 18,322.96 and 7,686.76

Step by Step Solution

1. Step 1: Write the proportion equation
   13,275.76 : 18,322.96 = 7,686.76 : x
2. Step 2: Convert to fraction form
   13,275.76/18,322.96 = 7,686.76/x
3. Step 3: Cross multiply
   13,275.76x = 18,322.96 × 7,686.76
4. Step 4: Simplify right side
   13,275.76x = 140,844,196.01
5. Step 5: Solve for x
   x = 140,844,196.01/13,275.76
6. Step 6: Final answer
   x = 10,609.12