Finding the Fourth Proportional to 105,058.34, 144,980.20 and 57,311.35

Step by Step Solution

1. Step 1: Write the proportion equation
   105,058.34 : 144,980.20 = 57,311.35 : x
2. Step 2: Convert to fraction form
   105,058.34/144,980.20 = 57,311.35/x
3. Step 3: Cross multiply
   105,058.34x = 144,980.20 × 57,311.35
4. Step 4: Simplify right side
   105,058.34x = 8,309,010,985.27
5. Step 5: Solve for x
   x = 8,309,010,985.27/105,058.34
6. Step 6: Final answer
   x = 79,089.49