Finding the Fourth Proportional to 21,300.17, 31,742.60 and 20,658.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.17 : 31,742.60 = 20,658.83 : x
2. Step 2: Convert to fraction form
   21,300.17/31,742.60 = 20,658.83/x
3. Step 3: Cross multiply
   21,300.17x = 31,742.60 × 20,658.83
4. Step 4: Simplify right side
   21,300.17x = 655,764,715.15
5. Step 5: Solve for x
   x = 655,764,715.15/21,300.17
6. Step 6: Final answer
   x = 30,786.84