Finding the Fourth Proportional to 21,210.72, 31,794.24 and 10,100.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,210.72 : 31,794.24 = 10,100.88 : x
2. Step 2: Convert to fraction form
   21,210.72/31,794.24 = 10,100.88/x
3. Step 3: Cross multiply
   21,210.72x = 31,794.24 × 10,100.88
4. Step 4: Simplify right side
   21,210.72x = 321,149,802.93
5. Step 5: Solve for x
   x = 321,149,802.93/21,210.72
6. Step 6: Final answer
   x = 15,140.92