Finding the Fourth Proportional to 20,807.69, 31,207.46 and 17,320.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,807.69 : 31,207.46 = 17,320.10 : x
2. Step 2: Convert to fraction form
   20,807.69/31,207.46 = 17,320.10/x
3. Step 3: Cross multiply
   20,807.69x = 31,207.46 × 17,320.10
4. Step 4: Simplify right side
   20,807.69x = 540,516,085.31
5. Step 5: Solve for x
   x = 540,516,085.31/20,807.69
6. Step 6: Final answer
   x = 25,976.75