Finding the Fourth Proportional to 21,003.24, 31,507.29 and 6,964.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,003.24 : 31,507.29 = 6,964.50 : x
2. Step 2: Convert to fraction form
   21,003.24/31,507.29 = 6,964.50/x
3. Step 3: Cross multiply
   21,003.24x = 31,507.29 × 6,964.50
4. Step 4: Simplify right side
   21,003.24x = 219,432,521.21
5. Step 5: Solve for x
   x = 219,432,521.21/21,003.24
6. Step 6: Final answer
   x = 10,447.56