Finding the Fourth Proportional to 82,899.72, 124,350.84 and 20,570.28

Step by Step Solution

1. Step 1: Write the proportion equation
   82,899.72 : 124,350.84 = 20,570.28 : x
2. Step 2: Convert to fraction form
   82,899.72/124,350.84 = 20,570.28/x
3. Step 3: Cross multiply
   82,899.72x = 124,350.84 × 20,570.28
4. Step 4: Simplify right side
   82,899.72x = 2,557,931,597.04
5. Step 5: Solve for x
   x = 2,557,931,597.04/82,899.72
6. Step 6: Final answer
   x = 30,855.73