Finding the Fourth Proportional to 21,118.08, 31,633.78 and 10,556.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,118.08 : 31,633.78 = 10,556.50 : x
2. Step 2: Convert to fraction form
   21,118.08/31,633.78 = 10,556.50/x
3. Step 3: Cross multiply
   21,118.08x = 31,633.78 × 10,556.50
4. Step 4: Simplify right side
   21,118.08x = 333,941,998.57
5. Step 5: Solve for x
   x = 333,941,998.57/21,118.08
6. Step 6: Final answer
   x = 15,813.09