Finding the Fourth Proportional to 89,819.24, 123,959.79 and 57,136.32

Step by Step Solution

1. Step 1: Write the proportion equation
   89,819.24 : 123,959.79 = 57,136.32 : x
2. Step 2: Convert to fraction form
   89,819.24/123,959.79 = 57,136.32/x
3. Step 3: Cross multiply
   89,819.24x = 123,959.79 × 57,136.32
4. Step 4: Simplify right side
   89,819.24x = 7,082,606,228.57
5. Step 5: Solve for x
   x = 7,082,606,228.57/89,819.24
6. Step 6: Final answer
   x = 78,854.00