Finding the Fourth Proportional to 105,056.61, 144,978.55 and 57,310.96

Step by Step Solution

1. Step 1: Write the proportion equation
   105,056.61 : 144,978.55 = 57,310.96 : x
2. Step 2: Convert to fraction form
   105,056.61/144,978.55 = 57,310.96/x
3. Step 3: Cross multiply
   105,056.61x = 144,978.55 × 57,310.96
4. Step 4: Simplify right side
   105,056.61x = 8,308,859,879.91
5. Step 5: Solve for x
   x = 8,308,859,879.91/105,056.61
6. Step 6: Final answer
   x = 79,089.36