Finding the Fourth Proportional to 123,778.99, 185,638.62 and 57,155.07

Step by Step Solution

1. Step 1: Write the proportion equation
   123,778.99 : 185,638.62 = 57,155.07 : x
2. Step 2: Convert to fraction form
   123,778.99/185,638.62 = 57,155.07/x
3. Step 3: Cross multiply
   123,778.99x = 185,638.62 × 57,155.07
4. Step 4: Simplify right side
   123,778.99x = 10,610,188,320.80
5. Step 5: Solve for x
   x = 10,610,188,320.80/123,778.99
6. Step 6: Final answer
   x = 85,718.81