Finding the Fourth Proportional to 12,992.16, 17,926.56 and 7,687.68

Step by Step Solution

1. Step 1: Write the proportion equation
   12,992.16 : 17,926.56 = 7,687.68 : x
2. Step 2: Convert to fraction form
   12,992.16/17,926.56 = 7,687.68/x
3. Step 3: Cross multiply
   12,992.16x = 17,926.56 × 7,687.68
4. Step 4: Simplify right side
   12,992.16x = 137,813,656.78
5. Step 5: Solve for x
   x = 137,813,656.78/12,992.16
6. Step 6: Final answer
   x = 10,607.45