Finding the Fourth Proportional to 12,989.94, 17,926.29 and 7,684.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,989.94 : 17,926.29 = 7,684.62 : x
2. Step 2: Convert to fraction form
   12,989.94/17,926.29 = 7,684.62/x
3. Step 3: Cross multiply
   12,989.94x = 17,926.29 × 7,684.62
4. Step 4: Simplify right side
   12,989.94x = 137,756,726.66
5. Step 5: Solve for x
   x = 137,756,726.66/12,989.94
6. Step 6: Final answer
   x = 10,604.88