Finding the Fourth Proportional to 20,891.32, 31,320.54 and 10,354.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,891.32 : 31,320.54 = 10,354.10 : x
2. Step 2: Convert to fraction form
   20,891.32/31,320.54 = 10,354.10/x
3. Step 3: Cross multiply
   20,891.32x = 31,320.54 × 10,354.10
4. Step 4: Simplify right side
   20,891.32x = 324,296,003.21
5. Step 5: Solve for x
   x = 324,296,003.21/20,891.32
6. Step 6: Final answer
   x = 15,523.00