Finding the Fourth Proportional to 105,058.16, 144,980.05 and 57,311.49

Step by Step Solution

1. Step 1: Write the proportion equation
   105,058.16 : 144,980.05 = 57,311.49 : x
2. Step 2: Convert to fraction form
   105,058.16/144,980.05 = 57,311.49/x
3. Step 3: Cross multiply
   105,058.16x = 144,980.05 × 57,311.49
4. Step 4: Simplify right side
   105,058.16x = 8,309,022,685.77
5. Step 5: Solve for x
   x = 8,309,022,685.77/105,058.16
6. Step 6: Final answer
   x = 79,089.74