Finding the Fourth Proportional to 20,462.10, 30,638.48 and 13,026.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,462.10 : 30,638.48 = 13,026.30 : x
2. Step 2: Convert to fraction form
   20,462.10/30,638.48 = 13,026.30/x
3. Step 3: Cross multiply
   20,462.10x = 30,638.48 × 13,026.30
4. Step 4: Simplify right side
   20,462.10x = 399,105,966.89
5. Step 5: Solve for x
   x = 399,105,966.89/20,462.10
6. Step 6: Final answer
   x = 19,504.64