Finding the Fourth Proportional to 20,923.53, 31,389.89 and 9,830.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,923.53 : 31,389.89 = 9,830.31 : x
2. Step 2: Convert to fraction form
   20,923.53/31,389.89 = 9,830.31/x
3. Step 3: Cross multiply
   20,923.53x = 31,389.89 × 9,830.31
4. Step 4: Simplify right side
   20,923.53x = 308,572,300.41
5. Step 5: Solve for x
   x = 308,572,300.41/20,923.53
6. Step 6: Final answer
   x = 14,747.62