Finding the Fourth Proportional to 105,155.12, 145,108.56 and 57,399.24

Step by Step Solution

1. Step 1: Write the proportion equation
   105,155.12 : 145,108.56 = 57,399.24 : x
2. Step 2: Convert to fraction form
   105,155.12/145,108.56 = 57,399.24/x
3. Step 3: Cross multiply
   105,155.12x = 145,108.56 × 57,399.24
4. Step 4: Simplify right side
   105,155.12x = 8,329,121,061.49
5. Step 5: Solve for x
   x = 8,329,121,061.49/105,155.12
6. Step 6: Final answer
   x = 79,207.95