Finding the Fourth Proportional to 105,059.54, 144,981.98 and 57,312.89

Step by Step Solution

1. Step 1: Write the proportion equation
   105,059.54 : 144,981.98 = 57,312.89 : x
2. Step 2: Convert to fraction form
   105,059.54/144,981.98 = 57,312.89/x
3. Step 3: Cross multiply
   105,059.54x = 144,981.98 × 57,312.89
4. Step 4: Simplify right side
   105,059.54x = 8,309,335,260.25
5. Step 5: Solve for x
   x = 8,309,335,260.25/105,059.54
6. Step 6: Final answer
   x = 79,091.68