Finding the Fourth Proportional to 21,106.50, 31,659.78 and 7,255.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,106.50 : 31,659.78 = 7,255.50 : x
2. Step 2: Convert to fraction form
   21,106.50/31,659.78 = 7,255.50/x
3. Step 3: Cross multiply
   21,106.50x = 31,659.78 × 7,255.50
4. Step 4: Simplify right side
   21,106.50x = 229,707,533.79
5. Step 5: Solve for x
   x = 229,707,533.79/21,106.50
6. Step 6: Final answer
   x = 10,883.26