Finding the Fourth Proportional to 82,570.28, 123,857.76 and 20,240.72

Step by Step Solution

1. Step 1: Write the proportion equation
   82,570.28 : 123,857.76 = 20,240.72 : x
2. Step 2: Convert to fraction form
   82,570.28/123,857.76 = 20,240.72/x
3. Step 3: Cross multiply
   82,570.28x = 123,857.76 × 20,240.72
4. Step 4: Simplify right side
   82,570.28x = 2,506,970,239.99
5. Step 5: Solve for x
   x = 2,506,970,239.99/82,570.28
6. Step 6: Final answer
   x = 30,361.65