Finding the Fourth Proportional to 21,118.83, 31,685.28 and 7,080.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,118.83 : 31,685.28 = 7,080.25 : x
2. Step 2: Convert to fraction form
   21,118.83/31,685.28 = 7,080.25/x
3. Step 3: Cross multiply
   21,118.83x = 31,685.28 × 7,080.25
4. Step 4: Simplify right side
   21,118.83x = 224,339,703.72
5. Step 5: Solve for x
   x = 224,339,703.72/21,118.83
6. Step 6: Final answer
   x = 10,622.73