Finding the Fourth Proportional to 21,159, 31,736.82 and 10,618.26

Step by Step Solution

1. Step 1: Write the proportion equation
   21,159 : 31,736.82 = 10,618.26 : x
2. Step 2: Convert to fraction form
   21,159/31,736.82 = 10,618.26/x
3. Step 3: Cross multiply
   21,159x = 31,736.82 × 10,618.26
4. Step 4: Simplify right side
   21,159x = 336,989,806.33
5. Step 5: Solve for x
   x = 336,989,806.33/21,159
6. Step 6: Final answer
   x = 15,926.55