Finding the Fourth Proportional to 13,689.72, 20,521.38 and 7,026.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,689.72 : 20,521.38 = 7,026.24 : x
2. Step 2: Convert to fraction form
   13,689.72/20,521.38 = 7,026.24/x
3. Step 3: Cross multiply
   13,689.72x = 20,521.38 × 7,026.24
4. Step 4: Simplify right side
   13,689.72x = 144,188,141.01
5. Step 5: Solve for x
   x = 144,188,141.01/13,689.72
6. Step 6: Final answer
   x = 10,532.59