Finding the Fourth Proportional to 21,118.96, 31,685.47 and 7,080.37

Step by Step Solution

1. Step 1: Write the proportion equation
   21,118.96 : 31,685.47 = 7,080.37 : x
2. Step 2: Convert to fraction form
   21,118.96/31,685.47 = 7,080.37/x
3. Step 3: Cross multiply
   21,118.96x = 31,685.47 × 7,080.37
4. Step 4: Simplify right side
   21,118.96x = 224,344,851.22
5. Step 5: Solve for x
   x = 224,344,851.22/21,118.96
6. Step 6: Final answer
   x = 10,622.91