Finding the Fourth Proportional to 21,070.82, 31,611.72 and 10,540.41

Step by Step Solution

1. Step 1: Write the proportion equation
   21,070.82 : 31,611.72 = 10,540.41 : x
2. Step 2: Convert to fraction form
   21,070.82/31,611.72 = 10,540.41/x
3. Step 3: Cross multiply
   21,070.82x = 31,611.72 × 10,540.41
4. Step 4: Simplify right side
   21,070.82x = 333,200,489.61
5. Step 5: Solve for x
   x = 333,200,489.61/21,070.82
6. Step 6: Final answer
   x = 15,813.37