Finding the Fourth Proportional to 105,056.70, 144,978.04 and 57,310.03

Step by Step Solution

1. Step 1: Write the proportion equation
   105,056.70 : 144,978.04 = 57,310.03 : x
2. Step 2: Convert to fraction form
   105,056.70/144,978.04 = 57,310.03/x
3. Step 3: Cross multiply
   105,056.70x = 144,978.04 × 57,310.03
4. Step 4: Simplify right side
   105,056.70x = 8,308,695,821.74
5. Step 5: Solve for x
   x = 8,308,695,821.74/105,056.70
6. Step 6: Final answer
   x = 79,087.73