Finding the Fourth Proportional to 21,109.48, 31,647.76 and 10,574.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,109.48 : 31,647.76 = 10,574.08 : x
2. Step 2: Convert to fraction form
   21,109.48/31,647.76 = 10,574.08/x
3. Step 3: Cross multiply
   21,109.48x = 31,647.76 × 10,574.08
4. Step 4: Simplify right side
   21,109.48x = 334,645,946.06
5. Step 5: Solve for x
   x = 334,645,946.06/21,109.48
6. Step 6: Final answer
   x = 15,852.87