Finding the Fourth Proportional to 20,397, 30,437.82 and 18,188.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,397 : 30,437.82 = 18,188.10 : x
2. Step 2: Convert to fraction form
   20,397/30,437.82 = 18,188.10/x
3. Step 3: Cross multiply
   20,397x = 30,437.82 × 18,188.10
4. Step 4: Simplify right side
   20,397x = 553,606,113.94
5. Step 5: Solve for x
   x = 553,606,113.94/20,397
6. Step 6: Final answer
   x = 27,141.55