Finding the Fourth Proportional to 15,836.49, 21,855.12 and 9,123.15

Step by Step Solution

1. Step 1: Write the proportion equation
   15,836.49 : 21,855.12 = 9,123.15 : x
2. Step 2: Convert to fraction form
   15,836.49/21,855.12 = 9,123.15/x
3. Step 3: Cross multiply
   15,836.49x = 21,855.12 × 9,123.15
4. Step 4: Simplify right side
   15,836.49x = 199,387,538.03
5. Step 5: Solve for x
   x = 199,387,538.03/15,836.49
6. Step 6: Final answer
   x = 12,590.39