Finding the Fourth Proportional to 12,111.36, 16,717.74 and 7,642.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.36 : 16,717.74 = 7,642.56 : x
2. Step 2: Convert to fraction form
   12,111.36/16,717.74 = 7,642.56/x
3. Step 3: Cross multiply
   12,111.36x = 16,717.74 × 7,642.56
4. Step 4: Simplify right side
   12,111.36x = 127,766,331.01
5. Step 5: Solve for x
   x = 127,766,331.01/12,111.36
6. Step 6: Final answer
   x = 10,549.30