Finding the Fourth Proportional to 20,936.28, 31,401.15 and 13,592.82

Step by Step Solution

1. Step 1: Write the proportion equation
   20,936.28 : 31,401.15 = 13,592.82 : x
2. Step 2: Convert to fraction form
   20,936.28/31,401.15 = 13,592.82/x
3. Step 3: Cross multiply
   20,936.28x = 31,401.15 × 13,592.82
4. Step 4: Simplify right side
   20,936.28x = 426,830,179.74
5. Step 5: Solve for x
   x = 426,830,179.74/20,936.28
6. Step 6: Final answer
   x = 20,387.11