Finding the Fourth Proportional to 82,758.38, 124,137.84 and 20,428.88

Step by Step Solution

1. Step 1: Write the proportion equation
   82,758.38 : 124,137.84 = 20,428.88 : x
2. Step 2: Convert to fraction form
   82,758.38/124,137.84 = 20,428.88/x
3. Step 3: Cross multiply
   82,758.38x = 124,137.84 × 20,428.88
4. Step 4: Simplify right side
   82,758.38x = 2,535,997,036.82
5. Step 5: Solve for x
   x = 2,535,997,036.82/82,758.38
6. Step 6: Final answer
   x = 30,643.39