Finding the Fourth Proportional to 105,056.93, 144,978.39 and 57,310.29

Step by Step Solution

1. Step 1: Write the proportion equation
   105,056.93 : 144,978.39 = 57,310.29 : x
2. Step 2: Convert to fraction form
   105,056.93/144,978.39 = 57,310.29/x
3. Step 3: Cross multiply
   105,056.93x = 144,978.39 × 57,310.29
4. Step 4: Simplify right side
   105,056.93x = 8,308,753,574.63
5. Step 5: Solve for x
   x = 8,308,753,574.63/105,056.93
6. Step 6: Final answer
   x = 79,088.11