Finding the Fourth Proportional to 21,118.50, 31,688.69 and 10,730.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,118.50 : 31,688.69 = 10,730.25 : x
2. Step 2: Convert to fraction form
   21,118.50/31,688.69 = 10,730.25/x
3. Step 3: Cross multiply
   21,118.50x = 31,688.69 × 10,730.25
4. Step 4: Simplify right side
   21,118.50x = 340,027,512.22
5. Step 5: Solve for x
   x = 340,027,512.22/21,118.50
6. Step 6: Final answer
   x = 16,100.93