Finding the Fourth Proportional to 12,398.72, 17,091.78 and 9,045.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,398.72 : 17,091.78 = 9,045.32 : x
2. Step 2: Convert to fraction form
   12,398.72/17,091.78 = 9,045.32/x
3. Step 3: Cross multiply
   12,398.72x = 17,091.78 × 9,045.32
4. Step 4: Simplify right side
   12,398.72x = 154,600,619.47
5. Step 5: Solve for x
   x = 154,600,619.47/12,398.72
6. Step 6: Final answer
   x = 12,469.08