Finding the Fourth Proportional to 21,045.86, 29,042.37 and 11,485.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,045.86 : 29,042.37 = 11,485.50 : x
2. Step 2: Convert to fraction form
   21,045.86/29,042.37 = 11,485.50/x
3. Step 3: Cross multiply
   21,045.86x = 29,042.37 × 11,485.50
4. Step 4: Simplify right side
   21,045.86x = 333,566,083.21
5. Step 5: Solve for x
   x = 333,566,083.21/21,045.86
6. Step 6: Final answer
   x = 15,849.49