Finding the Fourth Proportional to 16,690.32, 23,032.53 and 9,136.50

Step by Step Solution

1. Step 1: Write the proportion equation
   16,690.32 : 23,032.53 = 9,136.50 : x
2. Step 2: Convert to fraction form
   16,690.32/23,032.53 = 9,136.50/x
3. Step 3: Cross multiply
   16,690.32x = 23,032.53 × 9,136.50
4. Step 4: Simplify right side
   16,690.32x = 210,436,710.35
5. Step 5: Solve for x
   x = 210,436,710.35/16,690.32
6. Step 6: Final answer
   x = 12,608.31