Finding the Fourth Proportional to 16,931.61, 23,364.23 and 9,378.09

Step by Step Solution

1. Step 1: Write the proportion equation
   16,931.61 : 23,364.23 = 9,378.09 : x
2. Step 2: Convert to fraction form
   16,931.61/23,364.23 = 9,378.09/x
3. Step 3: Cross multiply
   16,931.61x = 23,364.23 × 9,378.09
4. Step 4: Simplify right side
   16,931.61x = 219,111,804.83
5. Step 5: Solve for x
   x = 219,111,804.83/16,931.61
6. Step 6: Final answer
   x = 12,940.99