Finding the Fourth Proportional to 21,111.18, 31,666.41 and 7,259.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,111.18 : 31,666.41 = 7,259.82 : x
2. Step 2: Convert to fraction form
   21,111.18/31,666.41 = 7,259.82/x
3. Step 3: Cross multiply
   21,111.18x = 31,666.41 × 7,259.82
4. Step 4: Simplify right side
   21,111.18x = 229,892,436.65
5. Step 5: Solve for x
   x = 229,892,436.65/21,111.18
6. Step 6: Final answer
   x = 10,889.61