Finding the Fourth Proportional to 20,145.88, 27,824.61 and 15,131.98

Step by Step Solution

1. Step 1: Write the proportion equation
   20,145.88 : 27,824.61 = 15,131.98 : x
2. Step 2: Convert to fraction form
   20,145.88/27,824.61 = 15,131.98/x
3. Step 3: Cross multiply
   20,145.88x = 27,824.61 × 15,131.98
4. Step 4: Simplify right side
   20,145.88x = 421,041,442.03
5. Step 5: Solve for x
   x = 421,041,442.03/20,145.88
6. Step 6: Final answer
   x = 20,899.63