Finding the Fourth Proportional to 82,758.25, 124,137.69 and 20,428.75

Step by Step Solution

1. Step 1: Write the proportion equation
   82,758.25 : 124,137.69 = 20,428.75 : x
2. Step 2: Convert to fraction form
   82,758.25/124,137.69 = 20,428.75/x
3. Step 3: Cross multiply
   82,758.25x = 124,137.69 × 20,428.75
4. Step 4: Simplify right side
   82,758.25x = 2,535,977,834.59
5. Step 5: Solve for x
   x = 2,535,977,834.59/82,758.25
6. Step 6: Final answer
   x = 30,643.20