Finding the Fourth Proportional to 21,833.18, 30,129.89 and 12,759.07

Step by Step Solution

1. Step 1: Write the proportion equation
   21,833.18 : 30,129.89 = 12,759.07 : x
2. Step 2: Convert to fraction form
   21,833.18/30,129.89 = 12,759.07/x
3. Step 3: Cross multiply
   21,833.18x = 30,129.89 × 12,759.07
4. Step 4: Simplify right side
   21,833.18x = 384,429,332.18
5. Step 5: Solve for x
   x = 384,429,332.18/21,833.18
6. Step 6: Final answer
   x = 17,607.57