Finding the Fourth Proportional to 12,493.76, 17,221.32 and 8,459.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,493.76 : 17,221.32 = 8,459.30 : x
2. Step 2: Convert to fraction form
   12,493.76/17,221.32 = 8,459.30/x
3. Step 3: Cross multiply
   12,493.76x = 17,221.32 × 8,459.30
4. Step 4: Simplify right side
   12,493.76x = 145,680,226.17
5. Step 5: Solve for x
   x = 145,680,226.17/12,493.76
6. Step 6: Final answer
   x = 11,660.24