Finding the Fourth Proportional to 105,057.34, 144,978.82 and 57,310.35

Step by Step Solution

1. Step 1: Write the proportion equation
   105,057.34 : 144,978.82 = 57,310.35 : x
2. Step 2: Convert to fraction form
   105,057.34/144,978.82 = 57,310.35/x
3. Step 3: Cross multiply
   105,057.34x = 144,978.82 × 57,310.35
4. Step 4: Simplify right side
   105,057.34x = 8,308,786,836.68
5. Step 5: Solve for x
   x = 8,308,786,836.68/105,057.34
6. Step 6: Final answer
   x = 79,088.11