Finding the Fourth Proportional to 105,056.15, 144,977.30 and 57,309.49

Step by Step Solution

1. Step 1: Write the proportion equation
   105,056.15 : 144,977.30 = 57,309.49 : x
2. Step 2: Convert to fraction form
   105,056.15/144,977.30 = 57,309.49/x
3. Step 3: Cross multiply
   105,056.15x = 144,977.30 × 57,309.49
4. Step 4: Simplify right side
   105,056.15x = 8,308,574,475.59
5. Step 5: Solve for x
   x = 8,308,574,475.59/105,056.15
6. Step 6: Final answer
   x = 79,086.99