Finding the Fourth Proportional to 16,692.59, 23,036.04 and 9,138.79

Step by Step Solution

1. Step 1: Write the proportion equation
   16,692.59 : 23,036.04 = 9,138.79 : x
2. Step 2: Convert to fraction form
   16,692.59/23,036.04 = 9,138.79/x
3. Step 3: Cross multiply
   16,692.59x = 23,036.04 × 9,138.79
4. Step 4: Simplify right side
   16,692.59x = 210,521,517.59
5. Step 5: Solve for x
   x = 210,521,517.59/16,692.59
6. Step 6: Final answer
   x = 12,611.68