Finding the Fourth Proportional to 23,121.93, 31,908.30 and 12,511.57

Step by Step Solution

1. Step 1: Write the proportion equation
   23,121.93 : 31,908.30 = 12,511.57 : x
2. Step 2: Convert to fraction form
   23,121.93/31,908.30 = 12,511.57/x
3. Step 3: Cross multiply
   23,121.93x = 31,908.30 × 12,511.57
4. Step 4: Simplify right side
   23,121.93x = 399,222,929.03
5. Step 5: Solve for x
   x = 399,222,929.03/23,121.93
6. Step 6: Final answer
   x = 17,265.99