Finding the Fourth Proportional to 21,179.82, 31,748.61 and 10,617.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,179.82 : 31,748.61 = 10,617.60 : x
2. Step 2: Convert to fraction form
   21,179.82/31,748.61 = 10,617.60/x
3. Step 3: Cross multiply
   21,179.82x = 31,748.61 × 10,617.60
4. Step 4: Simplify right side
   21,179.82x = 337,094,041.54
5. Step 5: Solve for x
   x = 337,094,041.54/21,179.82
6. Step 6: Final answer
   x = 15,915.81