Finding the Fourth Proportional to 21,300.80, 31,955.04 and 7,260.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.80 : 31,955.04 = 7,260.05 : x
2. Step 2: Convert to fraction form
   21,300.80/31,955.04 = 7,260.05/x
3. Step 3: Cross multiply
   21,300.80x = 31,955.04 × 7,260.05
4. Step 4: Simplify right side
   21,300.80x = 231,995,188.15
5. Step 5: Solve for x
   x = 231,995,188.15/21,300.80
6. Step 6: Final answer
   x = 10,891.38