Finding the Fourth Proportional to 21,836.63, 30,139.40 and 13,877.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,836.63 : 30,139.40 = 13,877.30 : x
2. Step 2: Convert to fraction form
   21,836.63/30,139.40 = 13,877.30/x
3. Step 3: Cross multiply
   21,836.63x = 30,139.40 × 13,877.30
4. Step 4: Simplify right side
   21,836.63x = 418,253,495.62
5. Step 5: Solve for x
   x = 418,253,495.62/21,836.63
6. Step 6: Final answer
   x = 19,153.76