Finding the Fourth Proportional to 12,499.72, 17,249.16 and 8,305

Step by Step Solution

1. Step 1: Write the proportion equation
   12,499.72 : 17,249.16 = 8,305 : x
2. Step 2: Convert to fraction form
   12,499.72/17,249.16 = 8,305/x
3. Step 3: Cross multiply
   12,499.72x = 17,249.16 × 8,305
4. Step 4: Simplify right side
   12,499.72x = 143,254,273.80
5. Step 5: Solve for x
   x = 143,254,273.80/12,499.72
6. Step 6: Final answer
   x = 11,460.60