Finding the Fourth Proportional to 20,495.13, 30,722.71 and 10,499.86

Step by Step Solution

1. Step 1: Write the proportion equation
   20,495.13 : 30,722.71 = 10,499.86 : x
2. Step 2: Convert to fraction form
   20,495.13/30,722.71 = 10,499.86/x
3. Step 3: Cross multiply
   20,495.13x = 30,722.71 × 10,499.86
4. Step 4: Simplify right side
   20,495.13x = 322,584,153.82
5. Step 5: Solve for x
   x = 322,584,153.82/20,495.13
6. Step 6: Final answer
   x = 15,739.55