Finding the Fourth Proportional to 21,117.83, 31,683.78 and 7,079.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,117.83 : 31,683.78 = 7,079.25 : x
2. Step 2: Convert to fraction form
   21,117.83/31,683.78 = 7,079.25/x
3. Step 3: Cross multiply
   21,117.83x = 31,683.78 × 7,079.25
4. Step 4: Simplify right side
   21,117.83x = 224,297,399.57
5. Step 5: Solve for x
   x = 224,297,399.57/21,117.83
6. Step 6: Final answer
   x = 10,621.24