Finding the Fourth Proportional to 20,854.89, 31,265.93 and 10,317.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,854.89 : 31,265.93 = 10,317.50 : x
2. Step 2: Convert to fraction form
   20,854.89/31,265.93 = 10,317.50/x
3. Step 3: Cross multiply
   20,854.89x = 31,265.93 × 10,317.50
4. Step 4: Simplify right side
   20,854.89x = 322,586,024.86
5. Step 5: Solve for x
   x = 322,586,024.86/20,854.89
6. Step 6: Final answer
   x = 15,468.12