Finding the Fourth Proportional to 21,488.64, 32,082.56 and 20,170.24

Step by Step Solution

1. Step 1: Write the proportion equation
   21,488.64 : 32,082.56 = 20,170.24 : x
2. Step 2: Convert to fraction form
   21,488.64/32,082.56 = 20,170.24/x
3. Step 3: Cross multiply
   21,488.64x = 32,082.56 × 20,170.24
4. Step 4: Simplify right side
   21,488.64x = 647,112,935.01
5. Step 5: Solve for x
   x = 647,112,935.01/21,488.64
6. Step 6: Final answer
   x = 30,114.19