Finding the Fourth Proportional to 23,028.91, 31,780.52 and 12,957.71

Step by Step Solution

1. Step 1: Write the proportion equation
   23,028.91 : 31,780.52 = 12,957.71 : x
2. Step 2: Convert to fraction form
   23,028.91/31,780.52 = 12,957.71/x
3. Step 3: Cross multiply
   23,028.91x = 31,780.52 × 12,957.71
4. Step 4: Simplify right side
   23,028.91x = 411,802,707.12
5. Step 5: Solve for x
   x = 411,802,707.12/23,028.91
6. Step 6: Final answer
   x = 17,881.99