Finding the Fourth Proportional to 21,833.62, 30,129 and 12,881.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,833.62 : 30,129 = 12,881.50 : x
2. Step 2: Convert to fraction form
   21,833.62/30,129 = 12,881.50/x
3. Step 3: Cross multiply
   21,833.62x = 30,129 × 12,881.50
4. Step 4: Simplify right side
   21,833.62x = 388,106,713.50
5. Step 5: Solve for x
   x = 388,106,713.50/21,833.62
6. Step 6: Final answer
   x = 17,775.65